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LCX-20C

Fish-finding Sonar & Mapping GPS

Operation Instructions

No part of this manual may be copied, reproduced, republished, transmitted or

distributed for any purpose, without prior written consent of Lowrance

Electronics. Any unauthorized commercial distribution of this manual is

strictly prohibited.

Lowrance

is a registered trademark of Lowrance Electronics, Inc.

MapCreate, FreedomMaps, IMS  and NauticPaths are

trademarks of LEI. Fishing Hot Spots is a registered trademark of

Fishing Hot Spots Inc. Navionics is a registered trademark of

Navionics, Inc.

eXitSource Database, copyright  2001-2004 Zenrin Co.

Ltd. Exit Authority and eXitSource are trademarks of

Zenrin Co. Ltd.

Lowrance Electronics may find it necessary to change or end our

policies, regulations and special offers at any time. We reserve the right

to do so without notice. All features and specifications subject to change

without notice. All screens in this manual are simulated. On the cover:

LCX-20C shown.

For free owner's manuals and other information,

visit our web site:

www.lowrance.com

Lowrance Electronics Inc.

12000 E. Skelly Dr.

Tulsa, OK USA 74128-2486

Printed in USA.

Table of Contents

Section 1: Read Me First!........................................................ 1

Capabilities and Specifications: LCX-20C .................................... 3

How Your Sonar Works ................................................................ 5

How Your GPS Works .................................................................. 6

Introduction to GPS and WAAS................................................... 7

How to use this manual: typographical conventions ................ 10

Section 2: Installation & Accessories.................................. 11

Preparations................................................................................ 11

Transducer Installation.............................................................. 11

Recommended Tools and supplies.......................................... 12

Shoot-thru-hull vs. Transom Mounting ................................. 14

Transom Transducer Assembly And Mounting..................... 15

TROLLING MOTOR BRACKET INSTALLATION .............. 21

TRANSDUCER ORIENTATION AND FISH ARCHES ....... 22

SHOOT-THRU-HULL PREPARATION ................................ 22

Speed/Temperature Sensors................................................. 27

GPS Antenna/Receiver Module.................................................. 28

Power Connections...................................................................... 31

Powering a NMEA 2000 Buss .................................................... 32

Powering Your Unit ................................................................ 32

NMEA 2000 Cable Connections................................................. 34

Connecting to a NMEA 2000 Network................................... 34

NMEA 0183 Wiring (Data cable) ........................................... 35

Mounting the Unit: Bracket or In-Dash .................................... 36

MMC or SDC Memory Card Installation................................... 40

Other Accessories........................................................................ 41

Section 3: Basic Sonar Operation....................................... 43

Keyboard ..................................................................................... 43

Power/lights on and off ............................................................... 44

Main Menu.................................................................................. 45

Pages ........................................................................................... 46

Satellite Status Page .............................................................. 46

Navigation Page...................................................................... 47

Map Page................................................................................. 47

Sonar Page .............................................................................. 48

LCX-20C Sonar Quick Reference ............................................... 51

Sonar Operations ........................................................................ 52

Fish Symbols vs. Full Sonar Chart ........................................ 54

Other Free Training Aids ....................................................... 54

Section 4: Sonar Options & Other Features..................... 57

ASP (Advanced Signal Processing) ..................................... 57

Alarms ......................................................................................... 58

Depth Alarms .......................................................................... 58

Zone Alarm .............................................................................. 59

Fish Alarm............................................................................... 60

Calibrate Speed........................................................................... 60

Chart Speed................................................................................. 61

ColorLine.................................................................................. 62

Depth Cursor............................................................................... 63

Depth Range - Automatic ........................................................... 64

Depth Range - Manual ............................................................... 65

Depth Range - Upper and Lower Limits ................................... 65

FasTrack .................................................................................. 66

Fish I.D. (Fish Symbols & Depths) ......................................... 67

FishTrack................................................................................. 69

Frequency (Change Transducer Frequency .............................. 69

HyperScroll.............................................................................. 70

Log Sonar Chart Data ................................................................ 70

Noise Rejection............................................................................ 71

Overlay Data ............................................................................... 71

Ping Speed & HyperScroll ....................................................... 74

Reset Options.............................................................................. 75

Reset Water Distance ................................................................. 76

Set Keel Offset ............................................................................ 76

Sensitivity & Auto Sensitivity.................................................... 77

Automatic Sensitivity ............................................................. 78

Sonar Chart Mode....................................................................... 79

Sonar Page & Sonar Chart Display Options ............................. 79

Full Sonar Chart ..................................................................... 80

Split Zoom Sonar Chart.......................................................... 81

Split Frequency Sonar Chart ................................................. 81

Digital Data/Chart .................................................................. 82

Customize Page Displays ........................................................... 82

FlashGraf



 ............................................................................. 83

Map With Sonar Split Screen................................................. 84

Sonar Simulator.......................................................................... 85

Stop Chart ................................................................................... 86

Surface Clarity ............................................................................ 87

Transparency .............................................................................. 88

Upper and Lower Limits ............................................................ 88

Zoom & Zoom Bar ....................................................................... 89

Zoom Pan..................................................................................... 89

Notes........................................................................................... 90

Section 5: Sonar Troubleshooting ....................................... 91

Section 6: Basic GPS Operations ......................................... 95

iii

Keyboard ..................................................................................... 95

Power/lights on and off ............................................................... 96

Main Menu .................................................................................. 96

Pages ........................................................................................... 98

Sonar Page .............................................................................. 98

Satellite Status Page .............................................................. 98

Navigation Page.................................................................... 100

Map Page............................................................................... 101

GPS Quick Reference................................................................ 107

Find Your Current Position...................................................... 108

Moving Around the Map: Zoom & Cursor Arrow Keys........... 108

Selecting Any Map Item With the Cursor ............................... 109

Searching................................................................................... 109

Set a Waypoint.......................................................................... 111

Navigate To a Waypoint ........................................................... 113

Set Man Overboard (MOB) Waypoint...................................... 114

Navigate Back to MOB Waypoint............................................ 114

Navigate to Cursor Position on Map........................................ 115

Navigate to a Point of Interest................................................. 117

Creating and Saving a Trail..................................................... 117

Displaying a Saved Trail .......................................................... 119

Navigating Trails...................................................................... 119

Visual Trailing ...................................................................... 120

Navigate a Trail (forward).................................................... 120

Transfer Custom Maps and GPS Data Files ........................... 122

Custom Maps: ....................................................................... 122

GPS Data files:...................................................................... 123

Cancel Navigation..................................................................... 124

Section 7: Advanced GPS Operations............................... 125

Find Distance From Current Position ..................................... 125

Find Distance From Point to Point .......................................... 125

Icons........................................................................................... 125

Create Icon on Map............................................................... 126

Create Icon at Current Position ........................................... 126

Delete an Icon ....................................................................... 126

Navigate to an Icon............................................................... 127

Routes........................................................................................ 127

Create and Save a Route ...................................................... 128

PC-created Routes............................................................. 128

Routes Created in the Unit............................................... 128

Delete a Route....................................................................... 130

Edit a Route .......................................................................... 130

Navigate a Route................................................................... 131

Navigate a Route in Reverse ................................................ 132

Trails ......................................................................................... 132

Delete a Trail ........................................................................ 132

Edit a Trail Name ................................................................. 132

Edit a Trail Color .................................................................. 133

Edit a Trail Pattern .............................................................. 133

Utilities...................................................................................... 134

Alarm Clock........................................................................... 134

Sun/Moon Rise & Set Calculator.......................................... 134

Trip Calculator...................................................................... 134

Trip Down Timer................................................................... 134

Trip Up Timer ....................................................................... 134

Waypoints.................................................................................. 134

Delete a Waypoint................................................................. 134

Edit a Waypoint .................................................................... 134

Waypoint Name................................................................. 134

Waypoint Symbol .............................................................. 135

Waypoint Position ............................................................. 135

Selecting a Waypoint ............................................................ 135

Set a Waypoint by Average Position.................................... 135

Set a Waypoint by Projecting a Position.............................. 135

Section 8: System & GPS Setup Options .......................... 137

Alarms ....................................................................................... 137

Auto Satellite Search................................................................ 138

Check MMC Files and Storage Space...................................... 138

Communications Port Configuration ....................................... 139

Configure NMEA ...................................................................... 139

Coordinate System Selection.................................................... 140

Map Fix ..................................................................................... 141

Customize Page Displays ......................................................... 143

GPS Simulator .......................................................................... 144

Hide GPS Features ................................................................... 145

Initialize GPS............................................................................ 145

Map Auto Zoom......................................................................... 146

Map Data................................................................................... 146

Pop-up Map Info.................................................................... 146

Map Boundaries .................................................................... 147

Fill Water With White .......................................................... 147

Map Overlays (Range Rings; Lat/Long Grid) ...................... 147

Map Datum Selection ............................................................... 147

Map Detail Category Selection................................................. 148

Map Orientation ....................................................................... 149

Navionics Charts..................................................................... 150

WARNING!

A CAREFUL NAVIGATOR NEVER RELIES ON ONLY ONE METHOD

TO OBTAIN POSITION INFORMATION.

CAUTION

When showing navigation data to a position (waypoint), a GPS unit will show

the shortest, most direct path to the waypoint. It provides navigation data to the

waypoint regardless of obstructions. Therefore, the prudent navigator will not

only take advantage of all available navigation tools when traveling to a

waypoint, but will also visually check to make sure a clear, safe path to the

waypoint is always available.

WARNING!

When a GPS unit is used in a vehicle, the vehicle operator is solely

responsible for operating the vehicle in a safe manner. Vehicle

operators must maintain full surveillance of all pertinent driving,

boating or flying conditions at all times. An accident or collision

resulting in damage to property, personal injury or death could occur if

the operator of a GPS-equipped vehicle fails to pay full attention to

travel conditions and vehicle operation while the vehicle is in motion.

Section 1:

Read Me First!

How this manual can get you out on the road, fast!

Welcome to the exciting world of digital sonar and GPS! We know

you're anxious to begin navigating and finding fish, but we have a favor

to ask. Before you grab the unit and begin installing it, please give us a

moment or two to explain how our manual can help you get the best

performance from your combination fish finder and GPS receiver.

First, we want to thank you for buying a Lowrance sonar/GPS unit.

Whether you're a first time user or a professional fisherman, you'll

discover that your unit is easy to use, yet capable of handling

demanding navigation and sonar tasks. When you team your unit with

our custom mapping software MapCreate 6, you have an incredible

combination. With a full VGA color display, recording capability and

remarkable resolution, you won't find another GPS/sonar unit with this

much power and this many features for this price!

Our goal for this book is to get you on the water. Like you, we'd rather

spend more time boating or fishing and less time reading the manual!

So, we designed our book so you don't have to read the whole thing from

front to back to find the information you want. At the start (or end) of

each segment, we'll tell you what content is coming up next. If it's a

concept you're already familiar with, we'll show you how and where to

skip ahead for the next important topic. We've also made it easy to look

up any tips you may need from time to time. Here's how:

The manual is organized into 10 sections. This first section is an

introduction to the LCX-20C sonar and GPS. It tells you the basics you

need to know so you’ll easily be able to make the unit, not only tell you

where you are, but also where to find fish.

Section 2 will help you install your unit, the transducer and the GPS

antenna module. We'll also show you how to install the MultiMedia

Card (MMC) and give you some information on available accessories.

Section 3 covers Basic Sonar Operation. It will show you how easy it is

to run your sonar, right out of the box. This section features a one-page

Sonar Quick Reference. (If you've already jumped ahead and

figured out how to install the unit yourself, and you just can't

wait any longer, turn to the Quick Reference on page 51 and

head for the water with your unit!)

After you've gained some experience with your sonar, you'll want to

check out Section 4, which discusses advanced Sonar Options and

Other Features.

When you come to a sonar menu command on the unit's screen, you can

look it up in the manual by skimming over the table of contents, flipping

through Section 3, or scanning through the sonar options in Section 4.

If you're having difficulty with your sonar, you can find an answer to

the most common problems in Section 5, Sonar Troubleshooting.

The manual switches from sonar to navigation in Section 6, which

introduces you to Basic GPS Operations. This section features a one-

page GPS Quick Reference on page 107.

Section 6 contains short, easy-to-scan GPS lessons that follow one

another in chronological order. They're all you'll need to know to find

your way on the water quickly.

After you've learned the basics (or if you already have some GPS

experience), you may want to try out some of the unit's many advanced

navigation features. That brings us to Section 7, Advanced GPS

Operations. This section contains the rest of the unit's GPS command

functions, organized in alphabetical order.

When you come to a GPS menu command on the screen, you can look it up

in the manual by skimming over the table of contents, flipping through

Section 6, or scanning through the command portion of Section 7.

This unit is ready to use right out of the box, but you can fine tune and

customize its operation with dozens of options. Since sonar is the unit's

key feature, we put the main sonar options in Section 4. Some options,

such as screen brightness settings, affect both sonar and GPS

operations. We describe how to use those common options along with

GPS options in Section 8, System Setup and GPS Setup Options.

Section 8 is organized in alphabetical order.

In Section 9, we go into more detail on one of the unit's most remarkable

GPS capabilities — Searching. We'll introduce a search example in the

Basic GPS Operation section, but there are so many map items you can

search for, we had to give this function its own section in the manual! For

example, did you know your unit can look up business phone numbers,

like a virtual Yellow Pages? We’ll show you how in Section 9.

Finally, in Section 10, we offer Supplemental Material, including a list

of the GPS datums, warranties and customer service information.

Now, if you're into the fine details, glance over the next segment on

specifications to see how much sonar and GPS power your unit contains.

It's important to us (and our power users), but, if you don't care how

many watts of power the unit has, or how many waypoints it can store,

skip ahead to important information on how sonar works, on page 5.

(Background on GPS begins on page 6.)

Graph recording: .......... Up to 1 GB on one MMC (or SD) card

Audible alarms: ............. Deep/shallow/fish/zone.

Automatic ranging:....... Yes, with instant screen updates.

Auto bottom track:........ Yes

Zoom bottom track: ...... Yes.

Split-screen zoom:......... Yes.

Surface water temp: ..... Yes, built into transducer.

Speed/distance log: ....... Yes, with optional speed sensor.

GPS

Receiver/antenna:......... External; LGC-2000.

Recording:........................MMC & SD memory cards for recording GPS

trip details and displaying charts or custom

maps.

Background map:.......... Built-in custom, detailed Lowrance map.

Contains: enhanced detail of continental U.S.

and Hawaii.

Custom mapping: .......... MapCreate 6 software optional; optional

plug and play LEI FreedomMaps offer the

same high-detail without the computer work

of MapCreate. Other plug and play mapping

options include IMS Fishing Hot Spots,

LEI NauticPaths charts and Navionics

charts.

Mapping memory: ......... Up to 1 GB on one MMC (or SD) card.

Position updates: .......... Every second.

Position points: ............. 1,000 waypoints; 1,000 event marker icons.

Audible alarms: ............. Arrival/off-course/anchor.

Symbols for

waypoints or icons:....... 42.

Routes:............................. 100; up to 100 waypoints per route.

Plot Trails: ...................... 10 savable; up to 9,999 points per trail.

Zoom range:.................... 37 ranges; 0.05 to 4,000 miles.

NOTE:

The above memory capacities refer only to the unit's on-board

memory. The amount of GPS or sonar data you can record and save

for recall later is only limited by the number of MMC cards you have.

NOTICE!

The storage and operation temperature range for your unit is from -

4 degrees to +167 degrees Fahrenheit (-20 degrees to +75 degrees

Celsius). Extended storage or operation in temperatures higher or

lower than specified will damage the liquid crystal display in your

unit. This type of damage is not covered by the warranty. For more

information, contact the factory's Customer Service Department.

Phone numbers are listed on the last page.

How Your Sonar Works

Sonar has been around since the 1940s, so if you already know how it

works, skip down to read about the relatively new technology of GPS.

But, if you've never owned a sonar fish finder, this segment will tell you

the underwater basics.

Sonar is an abbreviation for SOund NAvigation and Ranging, a

technology developed during World War II for tracking enemy

submarines. (Lowrance developed the world's first transistorized

sportfishing sonar in 1957.) A sonar consists of a transmitter,

transducer, receiver and display. Here’s a simple explanation of how it

finds the bottom and the fish.

The transmitter emits an electrical impulse, which the transducer

converts into a sound wave and sends into the water. (The sound

frequency can't be heard by humans or fish.) The sound wave strikes an

object (fish, structure, bottom) and bounces back to the transducer,

which converts the sound back into an electrical signal.

The receiver amplifies this return signal, or echo, and sends it to the

display, where an image of the object appears on the scrolling sonar

chart. The sonar's microprocessor calculates the time lapse between the

transmitted signal and echo return to determine the distance to the

object. The whole process repeats itself several times each second.

Your sonar unit can record a log of the sonar signals that scroll across

the screen and save them to the MMC memory card. (These recordings

are also called sonar charts or sonar graphs.) You can replay this sonar

personal computer using our free Sonar Viewer. The viewer is available

for download from the Lowrance web site, www.lowrance.com.

You can save several different sonar log files, erase 'em and record new

ones, over and over again. The size of your sonar recordings are only

limited by the free space available on your MMC.

How Your GPS Works

You'll navigate faster and easier if you understand how this unit scans

the sky to tell you where you are on the earth — and, where you're

going. (But if you already have a working understanding of GPS

receivers and the GPS navigation system, skip on ahead to Section 2,

Installation & Accessories on page 11. If you're new to GPS, read on, and

you can later impress your friends with your new-found knowledge.)

First, think of your unit as a small but powerful computer. (But don't

worry — we made the series easy to use, so you don't need to be a

computer expert to find your way!) The unit includes a keypad and a

screen with menus so you can tell it what to do. The screen also lets the

unit show your location on a moving map, as well as point the way to

your destination.

This gimbal-mounted unit uses an external antenna/receiver module,

which makes the whole system work something like your car radio. But

instead of your favorite dance tunes, this receiver tunes in to a couple of

dozen GPS satellites circling the earth. (It will also listen in to the

WAAS satellites in orbit, but more about that in the upcoming segment

introducing you to GPS and WAAS.)

Your unit listens to signals from as many satellites as it can "see" above

the horizon, eliminates the weakest signals, then computes its location

in relation to those satellites. Once it figures its latitude and longitude,

the unit plots that position on the moving map shown on the screen.

The whole process takes place several times a second!

The performance doesn't stop there. Stored in the permanent memory

of every unit is a basic background map of the entire world. We lock it

in here at the factory — you can't change or erase this map.

The background map is suitable for many navigation chores, but for

maximum accuracy and much more detail, you need our optional map-

making software, MapCreate 6. Some unit features — such as

searching for businesses and addresses — won't work without a custom

MapCreate map. There is so much detail in our background map (and

even more in MapCreate) that we'll describe its contents and

differences in Section 6, , on page 95.Basic GPS Operations

Another portion of the unit's onboard memory is devoted to recording

GPS navigation information, which includes waypoints, event marker

icons, trails and routes. This lets you look back the way you came. Think

of this data storage like the hard drive memory in a computer or a tape

in a cassette tape recorder. You can save several different GPS data files,

erase 'em and record new ones, over and over again. Like any computer

file, these GPS Data Files (file format *.usr) can be shared between

other Lowrance GPS or sonar/GPS units and even personal computers.

Your unit has one more thing in common with a personal computer.

Just as computers have a floppy disk drive for storing and exchanging

files, this unit has a slot for an MMC (MultiMedia Card) or SDC

(Secure Digital card) flash memory card. These solid-state memory

devices are about the size of a postage stamp, but can hold data ranging

from 8 MB to 1 GB in size. (Compare that to a floppy disk's 1.44 MB

capacity!) The unit uses all that MMC space for two key GPS purposes.

(The MMC is also used to record sonar logs. See page 5.)

First, you can backup your onboard GPS Data Files by copying them to

the MMC. Since the MMC is removable (like a floppy disk or a cassette

tape), you can store these GPS Data Files on a personal computer

equipped with an MMC card reader. (Or store them on a pocketful of

MMCs, if you don't have a computer.) Our MapCreate mapping software

can save, edit or create its own GPS Data Files, which can be copied to

the MMC and then loaded from the MMC into the unit's memory.

(NOTE: No matter where they come from, GPS Data Files must be

loaded from the MMC into memory before the unit can use them.)

The other key GPS use for MMCs is storage of special high-detail,

custom maps, which you can produce on your computer with our

MapCreate software. These MapCreate custom maps contain much

greater detail than the basic background map. These Custom Map

Files (file format *.lcm) can also be shared between other Lowrance

GPS or sonar/GPS units and personal computers. (For example, the

exact same MMC, custom map files and GPS data files can be used

interchangeably between your gimbal-mounted LCX-20C and the hand-

held iFINDER GPS receiver.)

The unit automatically reads Custom Map Files directly from the MMC

or SDC. To use a custom map, all you need to do is slide an MMC

containing a map into the unit.

Introduction to GPS and WAAS

Well, now you know the basics of how the unit does its work. You might

be ready to jump ahead to Section 2, Installation & Accessories, on page

11, so you can mount your unit and plug in the power. Or you might

want to see how our text formatting makes the manual tutorials easy to

skim. If that's the case, move on to "How to Use This Manual" on page

10. But, if you want to understand the current state of satellite

navigation, look over this segment describing how GPS and its new

companion WAAS work together to get you where you're going.

The Global Positioning System (GPS) was launched July 17, 1995 by

the United States Department of Defense. It was designed as a 24-

hour-a-day, 365-days-a-year, all weather global navigation system for

the armed forces of the U.S. and its allies. Civilian use was also

available, but it was less accurate because the military scrambled the

signal somewhat, using a process called Selective Availability (SA.)

GPS proved so useful for civilian navigation that the federal

government discontinued SA on May 2, 2000, after the military

developed other methods to deny GPS service to enemy forces. Reliable

accuracy for civilian users jumped from 100 meters (330 feet) under SA

to the present level of 10 to 20 meters (about 30 to 60 feet.)

Twenty-four satellites orbit 10,900 nautical miles above the Earth,

passing overhead twice daily. A series of ground stations (with precisely

surveyed locations) controls the satellites and monitors their exact

locations in the sky. Each satellite broadcasts a low-power signal that

identifies the satellite and its position above the earth. Three of these

satellites are spares, unused until needed. The rest virtually guarantee

at least four satellites are in view nearly anywhere on Earth at all times.

A minimum of three satellites are required to determine a 2D fix.

The system requires signal reception from three satellites in order to

determine a position. This is called a 2D fix. It takes four satellites to

determine both position and elevation (your height above sea level —

also called altitude). This is called a 3D fix.

Remember, the unit must have a clear view of the satellites in order to

receive their signals. Unlike radio or television signals, GPS works at

very high frequencies. These signals can be easily blocked by trees,

buildings, an automobile roof, even your body.

Like most GPS receivers, this unit doesn’t have a compass or any other

navigation aid built inside. It relies solely on the signals from the

satellites to calculate a position. Speed, direction of travel, and distance

are all calculated from position information. Therefore, in order for the

unit to determine direction of travel, you must be moving and the

faster, the better. This is not to say that it won’t work at walking or

trolling speeds — it will. There will simply be more "wandering" of the

data shown on the display.

GPS is plenty accurate for route navigation, but the U.S. Federal

Aviation Administration has special needs for aircraft traffic control

that go beyond basic GPS. The FAA has a plan under way to boost GPS

performance even further with its Wide Area Augmentation System, or

WAAS. This GPS add-on will include a time control element that will

help airliners fly closer together while avoiding collisions. In addition to

carefully spacing airplanes along travel corridors, WAAS will

eventually make instrument landings and takeoffs more accurate as it

replaces existing aviation navigation systems.

Non-aviators can use WAAS signals to make their GPS navigation even

more accurate. Your unit receives both GPS and WAAS signals. WAAS,

however, has some limits you should know about.

First, the U.S. government has not completed construction of the WAAS

system, so it is not yet fully operational. The ground stations are in place,

but only a few of the needed WAAS satellites have been launched.

WAAS can boost the accuracy of land GPS navigation, but the system is

designed for aircraft. The satellites are in a fixed orbit around the

Equator, so they appear very low in the sky to someone on the ground

in North America. Aircraft and vessels on open water can get

consistently good WAAS reception, but terrain, foliage or even large

man-made structures frequently block the WAAS signal from ground

receivers.

You'll find that using your GPS receiver is both easy and amazingly

accurate. It’s easily the most accurate method of electronic navigation

available to the general public today. But remember this receiver is

only a tool. Always have another method of navigation available, such

as a map or chart and a compass.

Also remember this unit will always show navigation information in

the shortest line from your present position to a waypoint, regardless of

terrain! It only calculates position, it can’t know what’s between you

and your destination. It’s up to you to safely navigate around obstacles,

no matter how you’re using this product.

How to use this manual: typographical conventions

Many instructions are listed as numbered steps. The keypad and arrow

"keystrokes" appear as boldface type, so you can easily skim the

instructions and pick out what menu command to use.

Arrow Keys

The arrow keys control the movement of dotted cross-hair lines on your

mapping screen called the cursor. The arrow keys also control a

horizontal line depth cursor on the sonar screen. The arrow keys also

help you move around the menus so you can execute different

commands. They are represented by symbols like these, which denote

the down arrow, up arrow, left arrow and right arrow: ↓

↓

↓↓ ↑

↑

↑↑ ←

←

←← →

→

→→ .

Keyboard

The other keys perform a variety of functions. When the text refers to a

key to press, the key is shown in bold. For example, the "Enter/Icons"

key is shown as ENT and the "Menu" key is shown as MENU.

Menu Commands

A menu command or a menu option will appear in small capital letters, in

a bold sans serif type like this: R POUTE LANNING. These indicate that you are

to select this command or option from a menu or take an action of some

kind with the menu item. Text that you may need to enter or file names

you need to select are show in italic type, such as trail name.

Instructions = Menu Sequences

Most functions you perform with this unit are described as a sequence

of key strokes and selecting menu commands. We've written them in a

condensed manner for quick and easy reading.

For example, instructions for navigating a trail would look like this:

1. From the Map Page, press MENU MENU| |↓

↓

↓↓ to M TY RAILS|ENT.

2. Press ↓

↓

↓↓ to Trail 1| | | | .ENT →

→

→→ ↓

↓

↓↓ to NAVIGATE ENT

3. You are asked to wait while it converts the trail into a route.

4. The wait message disappears and the unit begins showing

navigation information along the trail. Now, begin moving and

follow your unit's directions.

In clearer terms, step 1 (above) means: "Start on the Map Page. Press the

Menu key twice. Next, repeatedly press (or press and hold) the down

arrow key to scroll down the menu and select (highlight) the My Trails

menu command. Finally, press the Enter key."

Step 2: "Press the down arrow key repeatedly to scroll to the trail

named Trail 1, and press Enter. Next, press the right arrow key and

then the down arrow key to highlight the Navigate command, then

press Enter."

Section 2:

Installation & Accessories

Preparations

You can install the sonar and GPS systems in some other order if you

prefer, but we recommend this installation sequence:

CAUTION:

You should read over this entire installation section before

drilling any holes in your vehicle or vessel!

1. Determine the approximate location for the sonar/GPS unit, so you

can plan how and where to route the cables for the antenna, transducer

and power. This will help you make sure you have enough cable length

for the desired configuration.

2. Determine the approximate location for the transducer and its cable

route.

3. Determine the approximate location for the GPS antenna module

and its cable route.

4. Determine the location of your battery or other power connection,

along with the power cable route.

5. Install the transducer and route the transducer cable to the

sonar/GPS unit.

6. Install the GPS antenna and route the antenna cable to the

sonar/GPS unit.

7. Install the power cable and route it to the sonar/GPS unit.

8. Mount the sonar/GPS unit.

Transducer Installation

These instructions will help you install your Skimmer  transducer on a

transom, on a trolling motor or inside a hull. These instructions cover

both single- and dual-frequency Skimmer transducers. Please read all

instructions before proceeding with any installation.

The smaller single-frequency Skimmers typically use a one-piece,

stainless steel mounting bracket. The larger dual-frequency Skimmers

typically use a two-piece, plastic mounting bracket. The trolling motor

mount uses a one-piece plastic bracket with an adjustable strap.

These are all "kick-up" mounting brackets. They help prevent damage if

the transducer strikes an object while the boat is moving. If the

transducer does "kick-up," the bracket can easily be pushed back into

place without tools.

Read these instructions carefully before attempting the installation.

Determine which of the mounting positions is right for your boat. Use

extreme care if mounting the transducer inside the hull, because once

the epoxy is applied and it is set into position, the transducer cannot be

removed. Remember, the transducer installation is the most

critical part of a sonar installation.

Recommended Tools and supplies

If you prefer the option of routing the cable through the transom, you

will need a 1" drill bit. A transom mount requires use of a high quality,

marine grade above- or below-waterline caulking compound.

NOTE

The following installation types also call for these recommended

tools and required supplies (supplies are not included):

Single-frequency transom installations

Tools include: two adjustable wrenches, drill, #29 (0.136") drill bit, flat-

head screwdriver. Supplies: high quality, marine grade above- or below-

waterline sealant/adhesive compound.

Dual-frequency transom installations

Tools: two adjustable wrenches, drill, #20 (0.161") drill bit, flat-head

screwdriver. Supplies: four, 1" long, #12 stainless steel slotted wood

screws, high quality, marine grade above- or below-waterline

sealant/adhesive compound.

Single-frequency trolling motor installations

Tools: two adjustable wrenches, flat-head screwdriver. Supplies: plastic

cable ties.

Shoot-through hull installations

Tools: these will vary depending on your hull's composition. Consult your

boat dealer or manufacturer. Other tools are a wooden craft stick or

similar tool for stirring and applying epoxy, and a paper plate or piece

of cardboard to mix the epoxy on. Supplies: rubbing alcohol, 100 grit

sandpaper, specially formulated epoxy adhesive available from LEI (see

ordering information on the inside back cover). A sandwich hull also

requires polyester resin.

Selecting a Transducer Location

1. The location must be in the water at all times, at all operating speeds.

2. The transducer must be placed in a location that has a smooth flow of

water at all times. If the transducer is not placed in a smooth flow of

water, interference caused by bubbles and turbulence will show on

the sonar's display in the form of random lines or dots whenever the

boat is moving.

NOTE:

Some aluminum boats with strakes or ribs on the outside of the

hull create large amounts of turbulence at high speed. These boats

typically have large outboard motors capable of propelling the boat

at speeds faster than 35 mph. Typically, a good transom location on

aluminum boats is between the ribs closest to the engine.

3. The transducer should be installed with its face pointing straight

down, if possible. For shoot-thru applications: Many popular fishing

boat hulls have a flat keel pad that offers a good mounting surface. On

vee hulls, try to place the transducer where the deadrise is 10° or less.

Left, vee pad hull; right, vee hull. A pod style transducer is shown here,

but the principle is the same for Skimmers inside a hull.

4. If the transducer is mounted on the transom, make sure it doesn't

interfere with the trailer or hauling of the boat. Also, don't mount it

closer than approximately one foot from the engine's lower unit. This

will prevent cavitation (bubble) interference with propeller operation.

5. If possible, route the transducer cable away from other wiring on the

boat. Electrical noise from engine wiring, bilge pumps and aerators

can be displayed on the sonar's screen. Use caution when routing the

transducer cable around these wires.

Good and poor transducer locations.

CAUTION: Clamp the

transducer cable to transom

near the transducer. This will

help prevent the transducer

from entering the boat if it is

knocked off at high speed.

Good location

Poor angle

Poor location

Good

location

Deadrise less than 10

°°

Pad Strakes

How low should you go?

For most situations, you should install your Skimmer transducer so

that its centerline is level with the bottom of the boat hull. This will

usually give you the best combination of smooth water flow and

protection from bangs and bumps.

Align transducer centerline with hull bottom.

However, there are times when you may need to adjust the transducer

slightly higher or lower. (The slots in the mounting brackets allow you

to loosen the screws and slide the transducer up or down.) If you

frequently lose bottom signal lock while running at high speed, the

transducer may be coming out of the water as you cross waves or

wakes. Move the transducer a little lower to help prevent this.

If you cruise or fish around lots of structure and cover, your transducer

may be frequently kicking up from object strikes. If you wish, you may

move the transducer a little higher for more protection.

There are two extremes you should avoid. Never let the edge of the

mounting bracket extend below the bottom of the hull. Never let the

bottom – the face – of the transducer rise above the bottom of the hull.

Shoot-thru-hull vs. Transom Mounting

In a shoot-thru-hull installation, the transducer is bonded to the inside

of the hull with epoxy. The sonar "ping" signal actually passes through

the hull and into the water. This differs from a bolt-thru-hull

installation (often called simply "thru-hull"). In that case, a hole is cut in

the hull and a specially designed transducer is mounted through the

hull with a threaded shaft and nut. This puts the transducer in direct

contact with the water.

Typically, shoot-thru-hull installations give excellent high speed

operation and good to excellent depth capability. There is no possibility

of transducer damage from floating objects, as there is with a transom-

mounted transducer. A transducer mounted inside the hull can't be

knocked off when docking or loading on a trailer.

Transom

Hull bottom

Transducer

centerline

However, the shoot-thru-hull installation does have its drawbacks.

First, some loss of sensitivity does occur, even on the best hulls. This

varies from hull to hull, even from different installations on the same

hull. This is caused by differences in hull lay-up and construction.

Second, the transducer angle cannot be adjusted for the best fish arches

on your sonar display. (This is not an issue for flasher-style sonars.)

Lack of angle adjustment can be particularly troublesome on hulls that

sit with the bow high when at rest or at slow trolling speeds.

Third, a transducer CAN NOT shoot through wood and metal hulls.

Those hulls require either a transom mount or a thru-hull installation.

Fourth, if your Skimmer transducer has a built in temp sensor, it will

only show the temperature of the bilge, not the water surface temp.

Follow the testing procedures listed in the shoot-thru-hull installation

section at the end of this lesson to determine if you can satisfactorily

shoot through the hull.

Transom Transducer Assembly And Mounting

The best way to install these transducers is to loosely assemble all of the

parts first, place the transducer's bracket against the transom and see if

you can move the transducer so that it's parallel with the ground.

The following instructions sometimes vary depending on the mounting

bracket that came with your transducer. Single-frequency Skimmers

come with a one-piece stainless steel bracket, while dual-frequency

Skimmers come with a two-piece plastic mounting bracket. Use the set of

instructions that fits your model.

1. Assembling the bracket.

A. One-piece bracket: Press the two small plastic ratchets into the

sides of the metal bracket as shown in the following illustration. Notice

there are letters molded into each ratchet. Place each ratchet into the

bracket with the letter "A" aligned with the dot stamped into the metal

bracket. This position sets the transducer's coarse angle adjustment for a

14° transom. Most outboard and stern-drive transoms have a 14° angle.

Align plastic ratchets in bracket.

B. Two-piece bracket: Locate the four plastic ratchets in the

transducer's hardware package. Press two ratchets into the sides of the

plastic bracket and two on either side of the transducer as shown in the

following illustrations. Notice there are letters molded into each ratchet.

Place the ratchets into the bracket with the letter "A" aligned with the

alignment mark molded into the bracket. Place the ratchets onto the

transducer with the letter "A" aligned with the 12 o'clock position on

the transducer stem. These positions set the transducer's coarse angle

adjustment for a 14° transom. Most outboard and stern-drive transoms

have a 14° angle.

Insert and align ratchets.

Dot

Alignment letters

Alignment

positions

Transducer bracket

Transducer

Add ratchets to bracket and transducer.

2. Aligning the transducer on the transom.

A. One-piece bracket: Slide the transducer between the two

ratchets. Temporarily slide the bolt though the transducer assembly

and hold it against the transom. Looking at the transducer from the

side, check to see if it will adjust so that its face is parallel to the

ground. If it does, then the "A" position is correct for your hull.

If the transducer's face isn't parallel with the ground, remove the

transducer and ratchets from the bracket. Place the ratchets into the

holes in the bracket with the letter "B" aligned with the dot stamped

in the bracket.

Reassemble the transducer and bracket and place them against the

transom. Again, check to see if you can move the transducer so it's

parallel with the ground. If you can, then go to step 3A. If it doesn't,

repeat step 2A, but use a different alignment letter until you can

place the transducer on the transom correctly.

Insert bolt and check transducer position on transom.

Ratchets

Trans

ducer

bracket

Ratchet Ratchet

Transducer

B. Two-piece bracket: Assemble the transducer and bracket as shown

in the following figure. Temporarily slide the bolt though the transducer

assembly but don't tighten the nut at this time. Hold the assembled

transducer and bracket against the transom. Looking at the transducer

from the side, check to see if it will adjust so that its face is parallel to

the ground. If it does, then the "A" positions are correct for your hull.

If the transducer's face isn't parallel with the ground, remove and

disassemble the transducer and ratchets. Place the ratchets into the

bracket holes with the letter "B" aligned with the bracket alignment

mark. Place them on the transducer aligned with the 12 o'clock

position on the transducer stem.

Reassemble the transducer and bracket and place them against the

transom. Again, check to see if you can move the transducer so it's

parallel with the ground. If you can, then go to step 3B. If it doesn't,

repeat step 2B, but use a different alignment letter until you can

place the transducer on the transom correctly.

Assemble transducer and bracket.

3. Assembling the transducer.

A. One-piece bracket: Once you determine the correct position for

the ratchets, assemble the transducer as shown in the following

figure. Don't tighten the lock nut at this time.

Assemble transducer and bracket.

Nut

Metal

washer

Metal washer

Bolt

Rubber

washers

Flat washer

Lock washer

Flat washer

Nut

Bolt

B. Two-piece bracket: Once you determine the correct position for

the ratchets, assemble the transducer as shown in the figure in step

2B. Don't tighten the lock nut at this time.

4. Drilling mounting holes.

Hold the transducer and bracket assembly against the transom. The

transducer should be roughly parallel to the ground. The

transducer's centerline should be in line with the bottom of the hull.

Don't let the bracket extend below the hull!

Mark the center of each slot for the mounting screw pilot holes. You

will drill one hole in the center of each slot.

Drill the holes. For the one-piece bracket, use the #29 bit (for the #10

screws). For the two-piece bracket, use the #20 bit (for the #12

screws).

Position transducer mount on transom and mark mounting holes.

Side view shown (left) and seen from above (right).

5. Attaching transducer to transom.

A. One-piece bracket: Remove the transducer from the bracket and

re-assemble it with the cable passing through the bracket over the

bolt as shown in the following figures.

For single-frequency Skimmer, route cable over bolt and through

bracket. Side view shown (left) and seen from above (right).

Transom

Both bracket types: Attach the transducer to the transom. Slide the

transducer up or down until it's aligned properly with the bottom of

the hull as shown in the preceding and following figures. Tighten the

bracket's mounting screws, sealing them with the caulking compound.

Adjust the transducer so that it's parallel to the ground and tighten

the nut until it touches the outer washer, then add 1/4 turn. Don't

over tighten the lock nut! If you do, the transducer won't "kick-up" if

it strikes an object in the water.

Align transducer centerline with hull bottom and attach transducer to

transom. Rear view of dual-frequency Skimmer shown.

6. Route the transducer cable through or over the transom to the sonar

unit. Make sure to leave some slack in the cable at the transducer. If

possible, route the transducer cable away from other wiring on the

boat. Electrical noise from the engine's wiring, bilge pumps, VHF radio

wires and cables, and aerators can be picked up by the sonar. Use

caution when routing the transducer cable around these wires.

WARNING:

Clamp the transducer cable to the transom close to the

transducer. This can prevent the transducer from

entering the boat if it is knocked off at high speed.

If you need to drill a hole in the transom to pass the connector through,

the required hole size be 1".

CAUTION:

If you drill a hole in the transom for the cable, make sure it is

located above the waterline. After installation, be sure to seal the

hole with the same marine grade above- or below-waterline

sealant used for the mounting screws.

Flat-bottom hull

Deep-"vee" hull

Bottom

hull

7. Make a test run to determine the results. If the bottom is lost at

high speed, or if noise appears on the display, try sliding the

transducer bracket down. This puts the transducer deeper into the

water, hopefully, below the turbulence causing the noise. Be careful

not to install the transducer bracket below the bottom of the hull!

TROLLING MOTOR BRACKET INSTALLATION

(single-frequency only)

1. Attach the optional TMB-S bracket to the transducer as shown in the

following figure, using the hardware supplied with the transducer.

(Note: The internal tooth washer is supplied with the TMB-S.)

Attach motor mounting bracket to transducer.

2. Slide the adjustable strap supplied with the TMB-S through the slot

in the transducer bracket and wrap it around the trolling motor.

Position the transducer to aim straight down when the motor is in

the water. Tighten the strap securely.

3. Route the transducer cable alongside the trolling motor shaft. Use

plastic ties (not included) to attach the transducer cable to the

trolling motor shaft. Make sure there is enough slack in the cable for

the motor to turn freely. Route the cable to the sonar unit and the

transducer is ready for use.

Transducer mounted on trolling motor, side view.

TMB-S bracket

Bolt

Internal tooth washer

Nut

Flat washer

TRANSDUCER ORIENTATION AND FISH ARCHES

If you do not get good fish arches on your display, it could be because

the transducer is not parallel with the ground when the boat is at rest

in the water or at slow trolling speeds.

Transducer angles and their effects on fish arches.

If the arch slopes up – but not back down – then the front of the

transducer is too high and needs to be lowered. If only the back half of

the arch is printed, then the nose of the transducer is angled too far

down and needs to be raised.

NOTE:

Periodically wash the transducer's face with soap and water to

remove any oil film. Oil and dirt on the face will reduce the

sensitivity or may even prevent operation.

SHOOT-THRU-HULL PREPARATION

Hulls With Floatation Materials

The transducer installation inside a fiberglass hull must be in an area

that does not have air bubbles in the resin or separated fiberglass

Transducer aimed

too far back

Transducer aimed

too far forward

Proper transducer angle

Partial fish arches

Full fish arch

layers. The sonar signal must pass through solid fiberglass. A

successful transducer installation can be made on hulls with flotation

materials (such as plywood, balsa wood or foam) between layers of

fiberglass if the material is removed from the chosen area.

Use epoxy to place the transducer in a solid portion of the hull.

For example, some (but not all) manufacturers use a layer of fiberglass,

then a core of balsa wood, finishing with an outer layer of fiberglass.

Removing the inner layer of fiberglass and the balsa wood core exposes

the outer layer of fiberglass. The transducer can then be epoxied

directly to the outer layer of fiberglass. After the epoxy cures for 24

hours, fill the remaining space with polyester resin. When the job is

finished, the hull is watertight and structurally sound. Remember, the

sonar signal must pass through solid fiberglass. Any air bubbles in the

fiberglass or the epoxy will reduce or eliminate the sonar signals.

WARNING:

Do not remove any material from your inner hull unless

you know the hull's composition. Careless grinding or

cutting on your hull can result in damage that could

sink your boat. Contact your boat dealer or

manufacturer to confirm your hull specifications.

Testing Determines Best Location

Ideally, the shoot-thru transducer should be installed as close to the

transom as possible, close to the centerline. This will give you the best

performance during high speed maneuvers.

Inner hull

Epoxy to hull first Outer hull

Flotation material

Fill with resin

Shoot-thru-hull transducer locations for

high speed or trolling speed operation.

To choose the proper location for shoot-thru-hull mounting, follow these

testing procedures: (You may need a helper to complete these steps.)

1. Anchor the boat in about 30 feet of water. Add a little water to the

sump of the boat. Plug the transducer into the sonar unit, turn it on,

then hold the transducer over the side of the boat in the water. Adjust

the sensitivity and range controls until a second bottom echo is seen on

the display. (You'll need to turn off Auto Sensitivity, Auto Depth Range

and ASP. Try a range setting that is two to three times the water

depth. The harder (more rocky) the bottom, the easier it will be to get a

second bottom signal.) Don't touch the controls once they've been set.

Example of a second bottom signal. Unit is in 30 feet of water, with

range set at 80 feet and sensitivity set at 87 percent.

2. Next, take the transducer out of the water and place it in the water in

the sump of the boat, face down. (The transducer face is shown in the

figure on the following page.) Notice how the signal strength

decreases. The second bottom signal will probably disappear and the

bottom signal intensity will likely decrease.

Transducer location

(trolling speed)

Transducer location

(high speed)

Second bottom

True bottom

Manual range setting

3. Now move the transducer around to find the best location with the

strongest possible bottom signal. If you find a spot with an acceptable

bottom signal, mark the location and move on to step 4.

If you can't get an acceptable bottom signal, try turning up the

sensitivity by three or five keystrokes and then move the transducer

around once more. If you find a spot that works, mark it and move on to

step 4.

If you have to turn up sensitivity by more than five keystrokes to get a

good signal, the transducer should be mounted on the outside of the

hull. This is especially true if you have to turn sensitivity all the way

up to get a decent bottom signal.

4. Most people can get good results by following steps 1 through 3, so this

step is optional. If you want to make an extra effort to be absolutely sure

that your selected location will work under all conditions, make a test

run with the boat on plane and observe the bottom signal. You'll need to

figure some way to prop the transducer into position while you make

your test run. (A brick or two might be sufficient to hold it in place.)

5. When you're satisfied with a location, mark it and proceed with

the installation.

Shoot-thru-hull Installation

If you are installing the transducer on a hull with floatation material

sandwiched within the hull, refer to the text "Hulls With Flotation

Materials" beginning on page 22.

1. Make sure the area is clean, dry and free of oil or grease, then sand

both the inside surface of the hull and the face of the transducer with

100 grit sandpaper. The sanded hull area should be about 1-1/2 times

the diameter of the transducer. The surface of the hull must be flat

so the entire transducer face is in contact with the hull prior to

bonding. After sanding, clean the hull and transducer with rubbing

alcohol to remove any sanding debris.

Epoxy transducer to hull.

WARNING:

Use only the epoxy available from LEI. It has been

formulated to work with these installation procedures.

Other epoxy types may be too thin or may not cure to the

right consistency for optimum transducer performance.

2. The epoxy consists of the epoxy itself and a hardener. Remove the

two compounds from the package and place them on the paper plate.

Thoroughly stir the two compounds together until the mixture has a

uniform color and consistency. Do not mix too fast or bubbles will

form in the epoxy. After mixing, you have 20 minutes to complete the

installation before the epoxy becomes unworkable.

Spread a thin layer of epoxy (about 1/16" or 1.5 mm thick) on the face

of the transducer as shown in the previous figure. Make sure there

are no air pockets in the epoxy layer! Then, apply the remaining

epoxy to the sanded area on the hull.

3. Press the transducer into the epoxy, twisting and turning it to force

any air bubbles out from under the transducer face. Stop pressing

when you bottom out on the hull. When you're finished, the face of

the transducer should be parallel with the hull, with a minimum

amount of epoxy between the hull and transducer.

4. Apply a weight, such as a brick, to hold the transducer in place while

the epoxy cures. Be careful not to bump the transducer while the

epoxy is wet. Leave the weight in place for a minimum of three

hours. Allow the epoxy to cure for 24 hours before moving the boat.

5. After the epoxy has cured, route the cable to the sonar unit and it's

ready to use.

Spread epoxy here

Sand this surface

(unit's face)

Orient the Skimmer

with the nose facing

the bow of the boat.

To bow

Stern view showing good location for mounting sensor on transom.

Speed sensor mounting configuration:

side view (left) and rear view (right.)

If the base of the transom has a radius, fill the gap between the

transom and the sensor with the sealant. This will help ensure a

smooth water flow.

Route the sensor's cable through or over the transom to the sonar unit.

If you need to drill a hole in the transom to pass the connector through,

the required hole size is 7/8".

CAUTION:

If you drill a hole in the transom for the cable, make sure it is

located above the waterline. After installation, be sure to seal the

hole with the same marine grade above- or below-waterline

sealant used for the screws.

The sensor is now ready for use. Connect the sensor to the sonar socket

on the back of your unit and connect the transducer to the speed

sensor's socket. If you have any questions concerning the installation of

the sensor, please contact your local boat dealer.

GPS Antenna/Receiver Module

The LCX-20C packages include the LGC-2000 GPS module. This device

contains the unit's external antenna and receiver for GPS and WAAS

Good location

Transom

Bottom of hull

signals. The antenna/receiver module comes with a 25-foot Y-adapter

extension cable. This module can be mounted on a flat surface or pole,

or an optional magnet is available for temporary mounting on any

ferrous surface.

LGC-2000 Module, bottom view (left) and top view (right).

You need to select an antenna installation location that has a clear,

unobstructed view of the sky. After the module is installed, connect it to

the unit. The LGC-2000 can communicate with your GPS unit either

directly (using the supplied extension cable) or through a NMEA 2000

network.

NOTE

See the module’s instruction sheet, publication part number 988-

0147-981, for complete installation instructions.

In an automobile, you may achieve good results by simply placing the

external antenna on the top of the dash, at the base of the windshield. A

piece of the rubber non-skid shelf liner material available in recreational

vehicle supply stores will help hold the antenna in place. This may not

work well if you have a cab-over design pickup truck camper or motor

home. If dashboard reception is poor, simply relocate the antenna module

elsewhere on the vehicle for a clearer view of the sky.

Connecting Directly to the Unit

After the module is installed, attach it to the end of the Y-adapter

extension cable as shown in the following diagram. To connect it to the

unit, insert the extension cable's splitter plug into the Network socket

on the back of the unit and your system is ready to use.

LGC-2000 remote connection to NMEA 2000 buss.

NOTE:

An existing operational NMEA 2000 buss will already have

terminators in place and will already be powered. If you're connecting

to such a network, you won't need the terminators or extension cable

provided. Do not add terminators or power to a functional NMEA

2000 buss!

When the LGC-2000 is connected to the unit (directly or indirectly), it

will begin providing GPS signal information.

Power Connections

Your unit comes with a power/data cable that splits into three ends,

each with several exposed wires (shown in the following figure). The

end with 4 wires (blue, yellow, orange and shield) is a Data cable that

connects to a NMEA 0183 interface. The end with three wires (red,

black and shield) is a power cable that connects to a NMEA 2000 buss.

The thicker three-wire cable (red, black and white) is the Power Supply

for your unit (and optional external speaker connection for some units).

The Power/Data cable for this unit.

Depending on your configuration, you may not use all of these wires.

The following segments include instructions for installing all the wires

that you will use with this unit.

Caution

All of the wires in the power/data cable have bare ends for

easier installation. The bare ends on any unused wires could

cause an electrical short if left exposed. To prevent this, you

should cover the individual wire ends – either by capping them

with wire nuts or wrapping them with electrical tape. (You

should cut off the bare wire before taping off the ends.)

To NMEA 2000

network port

LGC-2000

To unit

Data Cable wires: blue,

yellow, orange and shield

Power Supply wires:

red, black and white

NMEA 2000 Power wires:

red, black and shield

Powering a NMEA 2000 Buss

(NMEA 2000 Power cable)

A NMEA 2000 buss must be connected to a power source to operate. If

you have a pre-existing NMEA 2000 installation, it may already be

connected to another power source. If your NMEA 2000 buss is already

powered, you can ignore the NMEA 2000 Power cable. Never attach

two power sources to a single NMEA 2000 buss.

If you do need to power your NMEA 2000 buss, attach the NMEA 2000

Power cable to your boat's battery just as indicated in the following

segment for connecting your unit's Power Supply cable. The NMEA

2000 Power cable's red wire should be attached (with provided 3-amp

fuse) to the boat battery's positive terminal, and the NMEA 2000 Power

cable's black and shield wires should both be attached to the battery's

negative terminal.

NOTE:

If the NMEA 2000 buss draws power directly from the boat's battery,

the LGC-2000 will remain on (drawing power) all the time. The LGC-

2000's current draw is very small and shouldn't decrease the boat's

storage battery life, but if this small draw is a concern, you can

install a switch between the NMEA 2000 buss and the battery.

Powering Your Unit

(Power Supply cable – red and black wires)

The unit works from a 12-volt battery system. For the best results,

attach the power cable directly to the battery. You can attach the power

cable to an accessory or power buss, however you may have problems

with electrical interference. Therefore, it's safer to go ahead and attach

the power cable directly to the battery.

CAUTION:

When using the unit in a saltwater environment, we strongly

recommend that you shut off the power supply to the power cable

when the unit is not in use. When the unit is turned off but still

connected to a power supply, electrolysis can occur in the power

cable plug. This may result in corrosion of the plug body along with

the electrical contacts in the cable and the unit's power socket.

In saltwater environments we recommend you connect the power

cable to the auxiliary power switch included in most boat designs.

If that results in electrical interference, or if such a switch is not

available, we recommend connecting direct to the battery and

installing an inline switch. This will let you shut off power to the

power cable when the unit is not in use. When you are not using

the unit, you should always shut off power to the power cable,

especially when the power cable is disconnected from the unit.

If possible, keep the power cable away from other boat wiring, especially

the engine's wires. This will provide the best isolation from electrical

noise. If the cable is not long enough, splice #18 gauge wire onto it. The

power cable has two wires, red and black. Red is the positive lead, black

is negative or ground. (There is also a white wire to power an optional

external speaker for some units.) Make sure to attach the in-line fuse

holder to the red lead as close to the power source as possible.

For example, if you have to extend the power cable to the battery or

power buss, attach one end of the fuse holder directly to the battery or

power buss. This will protect both the unit and the power cable in the

event of a short. It uses a 3-amp fuse.

Power connections for LCX-20C sonar/GPS unit.

NOTE:

If you're powering a NMEA 2000 buss, you will attach both the

NMEA 2000 Power cable and the unit's Power Supply cable to the

boat's battery. To attach the NMEA 2000 Power cable, connect the

red wire to battery's + and black and shield wires to battery's –.

WARNING:

This product must be independently fused with the

enclosed 3-amp fuse (or equivalent), even if you connect

to a fused accessory or power buss.

If a malfunction happens inside the unit, extensive

damage can occur if the enclosed fuse is not used. As with

12 volt

battery

Black wire Red wire with

3 amp fuse

To unit

Data Cable

Optional power off

switch for salt-

water installations

NMEA 2000 Power Cable

To power a

NMEA 2000

buss, also

connect

NMEA 2000

Power cable

to the boat's

battery.

External speaker wire

(not used by this unit)

all electrical devices, this unit could be damaged to a

point that it is unrepairable and could even cause harm

to the user when not properly fused.

CAUTION:

Do not use this product without a 3-amp fuse wired into the power

cable! Failure to use a 3-amp fuse will void your warranty.

This unit has reverse polarity protection. No damage will occur if the

power wires are reversed. However, the unit will not work until the

wires are attached correctly.

An optional 8-foot, CA-4 external power cable with a cigarette lighter

adapter is available from Lowrance.

NMEA 2000 Cable Connections

NMEA 2000 is a new buss network specifically designed for boats. This is

a very young industry standard and, at the time of printing, few boats

being built now have a NMEA 2000 buss installed. Over the next few

years, however, NMEA 2000 will become much more common. To help

you get the most out of this technology, your Lowrance unit is designed

to work with a NMEA 2000 network as soon as it becomes available.

Connecting to a NMEA 2000 Network

Your unit can be connected to a NMEA 2000 buss, receiving sensor

information from any Lowrance units attached to the buss. Contact LEI

Extras (look inside back cover for accessory ordering information) for a

NMEA 2000 buss adapter cable if you would like to do this. You can

connect both the unit and antenna module through the antenna's

extension cable (as described earlier), or you can connect the unit directly

to a network port. To do so, attach the adapter cable's manual locking

collar connector to the Network port on the back of the sonar unit and

attach the other end to an available port on the NMEA 2000 buss, as

shown in the following image.

Lowrance unit direct connection to NMEA 2000 buss.

As soon as the unit is connected to the network, it will begin receiving

shared information. Please note the buss must be powered to operate.

(See instructions in this section for more on powering NMEA 2000

buss.)

To NMEA 2000

network port

To sonar

unit's Network

socket

NMEA 0183 Wiring

(Data cable)

To exchange NMEA 0183 data, this unit has one NMEA 0183 version

2.0 communication port. Com port one (Com-1) can be used to receive

NMEA format GPS data. The com port can also transmit NMEA format

GPS data to another device.

The four wires for the com port are combined with the Power Supply

cable and NMEA 2000 Power cable to form the power/data cable (shown

earlier). Com-1 uses the yellow wire to transmit, the orange wire to

receive and the shield wire for signal ground. Your unit does not use

the blue wire.

Com-1 wiring to receive NMEA position information

from some other GPS receiver.

Com-1 wiring to transmit NMEA position information

to another NMEA-compatible device.

Ground To Other

Device

Com-1

To unit

Yellow (Transmit)

NMEA Receive

Shield (Ground)

Orange (Receive) NMEA Transmit

Shield (Ground) Ground

Com-1

To unit

To Other

GPS Receiver

Cable connections.

Mounting the Unit: Bracket or In-Dash

You can install the unit on top of a dash with the gimbal bracket. It can

also be installed in the dash or mounted on a portable power supply.

Sonar unit,

rear view

GPS

antenna

module

Power/Data

socket

LGC 2000 25'

extension cable

NMEA 2000

Power Cable

Sonar socket

Transducer

Power

Supply

Cable

Network

socket

SP-BL optional

speed sensor

60-ohm

terminator

NMEA 0183

Data Cable

If you use the supplied bracket, you may be interested in the optional

R-A-M bracket mounting system. This converts the unit's gimbal

bracket to a swivel mount, which can be used on the dash or overhead

mounting positions.

Optional R-A-M mounting system.

Bracket Installation

Mount the unit in any convenient location, provided there is clearance

behind the unit when it's tilted for the best viewing angle. You should

also make sure there is enough room behind the unit to attach the

power, transducer and GPS antenna/receiver module cables. (A

drawing on the next page shows the dimensions of a gimbal-mounted

unit.)

Holes in the bracket's base allow wood screw or through-bolt mounting.

You may need to place a piece of plywood on the back side of thin

fiberglass panels to reinforce the panel and secure the mounting

hardware.

Install the gimbal bracket. Place the bracket so the arms slope toward

the front of your unit.

Once a location is determined, use the bracket as a template and mark

the mounting holes and the hole for the cables. Drill a 1-inch (25.4 mm)

hole in the dash for the power, transducer and antenna cables. Screw

the bracket to the mounting surface.

Front

Screw

mounting

hole

Cable hole

Front view (left) and side view (right) showing dimensions of the

sonar/GPS unit when mounted on gimbal bracket.

To pass all connectors through the 1" hole, first pass the transducer

connector up through the hole from under the dash, followed by the

antenna connector and any accessory cables. Next, pass the power

cable's bare-wire end though the hole from the top.down

If you wish, you can fill in the hole around the cables with a good

marine caulking compound. No matter what type of installation you

prefer, be sure to leave enough slack in the cables to allow tilting or

swiveling the unit.

Attach the unit to the gimbal bracket using the supplied gimbal knobs

and washers. Attach the cables and the unit is ready to use.

In-Dash Installation

You can mount the unit in the dash with an optional FM-3 In-Dash

Adapter Kit. The kit includes mounting hardware and a template for

cutting the hole.

Millimeter

[Inch]

244

[9.58]

[3.61]

56.9

[2.24]

185

[7.34]

37.1

[1.37]

In-dash mounting template for this unit, showing dimensions.

NOTE: The figure above is not printed to scale.

MMC or SDC Memory Card Installation

Your unit uses MultiMedia Cards to store information, such as sonar

logs, custom maps, waypoints, trails and other data. The unit can also

use Secure Digital Cards (SD card) to store data. The unit can use up to

two cards; a MMC and a SD card can be used at the same time.

NOTE:

Throughout this manual, we will use the term MMC, but just

remember your unit can use an MMC or SD card to store data.

Both of these solid-state flash memory devices are about the size of a

postage stamp. A SD card is slightly thicker than a MMC. MMCs are

available in storage capacities of 8 MB, 16 MB, 32 MB and 64 MB. SD

cards are available in capacities of 8 MB, 16 MB, 32 MB, 64 MB, 128

MB, 256 MB and 1 GB.

Additional MMC cards are available from LEI Extras; see ordering

information inside the back cover of this manual. MMCs and SD cards

are also available at many camera and consumer electronics stores.

The MMC drawer is located on the front of the case. To install an

Visit our web site for a complete listing of all the available accessories

for your unit.

Face Cover

Your unit comes with a white protective cover that snaps on and off the

front of the unit. This cover is intended for use when your unit and the

vehicle it's mounted in are idle.

WARNING:

When the unit is mounted in an unprotected area, such

as an open boat cockpit, the protective face cover must

be removed when the vehicle is moving at high speed.

This includes towing a boat on a trailer at highway

speeds. Otherwise, wind blast can pop off the cover.

Now that you have your unit installed, move on to Sec. 3, Basic Sonar

Operations. In Sec. 3. we'll present a series of step-by-step tutorials to

teach you the basics of your sonar operation.

NOTE:

When you first turn the unit on, the Map Page appears. If you'd

rather start learning about GPS operation first, turn to Sec. 6,

Basic GPS Operations. (Remember, you don't need to read this

manual from cover-to-cover to get going. We designed it so you can

skip around to the section you want to read.)

Section 3:

Basic Sonar Operation

This section addresses the unit's most basic sonar operations. The

instructions presented in Sec. 3 follow a chronological order. Sec. 4,

Sonar Options & Other Features, will discuss other more advanced

functions and utilities. Material in Sec. 4 is arranged in alphabetical

order.

Before you turn on the unit, it's a good idea to learn about the different

keys, the Main Menu, the four Page screens and how they all work

together. BUT, if you just can't wait to get on the water, turn to the

one-page Quick Reference on page 51.

Keyboard

LCX-20C sonar/GPS unit, front view, showing sonar screen, keyboard

and access door for the MMC compartment.

1. PWR/LIGHT (Power & Light) – The PWR key turns the unit on and

off and activates the backlight.

MMC drawer

2. PAGES – Pressing this and the ←

←

←← →

→

→→ arrow keys switches the unit

between the four different page screens. (Satellite Status Page,

Navigation Page, Map Page and Sonar Page.) Each page represents one

of the unit's major operation modes.

3. MENU – Press this key to show the menus and submenus, which

allow you to select a command or adjust a feature. This also accesses

search functions for streets, intersections, addresses and highway exits.

4. ARROW KEYS – These keys are used to navigate through the

menus, make menu selections, enter data and move the map and sonar

chart cursors.

5. ENT/ICONS (Enter & Icons) – This key allows you to save data,

accept values or execute menu commands. It is also used to create

event marker icons.

6. EXIT – The Exit key lets you return to the previous screen, clear

data and close menus.

7. WPT – (Waypoint) The Waypoint key is used to save and recall

waypoints, search for waypoints and access the waypoint list. It also

launches the Point-of-Interest (POI) search menus and is involved in

some navigation functions.

8. ZOUT – (Zoom Out) – This key lets you zoom the screen out. On the

Sonar Page, this key returns you to a full sonar chart display, showing

the entire water column from surface to bottom. On the Map Page, this

lets you see a larger geographic area on the map. Less detail is seen as

you zoom out.

9. ZIN – (Zoom In) – This key lets you zoom the screen in. On the Sonar

Page, this key enlarges fish signals and bottom detail. On the Map

Page, zooming in lets you see greater detail in a smaller geographic

area on the map.

Power/lights on and off

To turn on the unit, press PWR. As the unit powers up, the Map Page is

displayed first. To switch to the Sonar Page, press PAGES| |

→

→→ EXIT.

To turn on the backlight, press PWR again. The unit has three backlight

levels to select from. Repeatedly pressing PWR will cycle through the

backlight settings and turn off the backlight.

Turn off the unit by pressing and holding the PWR key for 3 seconds.

Main Menu

The unit has a Main Menu, which contains some function commands

and some setup option commands. The instructions in this section will

deal only with sonar functions, the basic commands that make the unit

show sonar signals on your screen. This unit will work fine right out of

the box with the factory default settings. But, if you want to learn

about the various sonar options, see Sec. 4, Sonar Options & Other

Features. (For general system setup and GPS options, see Sec. 8,

System Setup and GPS Setup Options.)

You can access the Main Menu from any of the four Page screens by

pressing MENU MENU| . To clear the menu screen and return to the page

display, press EXIT. (Remember, our text style for "MENU|MENU" means

"press the Menu key twice." See a full explanation of our instruction

text formatting on page 10, Instructions = Menu Sequences.)

Main Menu.

The Main Menu commands and their functions are:

Screen command: changes the contrast or brightness of the display

screen.

Sounds command: enables or disables the sounds for key strokes and

alarms and sets the alarm style.

Transparency command: adjusts the level of transparency for menus.

Alarms command: turns GPS alarms on or off and changes alarm

thresholds.

Route Planning command: used to plan, view or navigate a route.

My Trails command: shows, creates and deletes plot trails. Also used

to navigate or backtrack a trail.

Cancel Navigation command: turns off the various navigation

commands. Used to stop navigating after you have reached your

destination waypoint, Point of Interest or map cursor location; or after

you reach the end of a route or trail.

Sonar Setup command: sets various sonar options.

GPS Setup command: sets various GPS receiver options.

System Setup command: sets general configuration options.

Sun/Moon Calculations command: finds the rising and setting time

of the sun and the moon.

Trip Calculator command: shows trip status and statistics.

Timers command: controls the up timer, down timer and alarm clock

settings.

Browse MMC Files command: this allows you to view the installed

MMC card and the files it contains.

Pages

The unit has four Page displays that represent the four major operating

modes. They are the Satellite Status Page, the Navigation Page, the Map

Page and Sonar Page. They are accessed by pressing the PAGES key, then

using →

→

→→ or ← to select a Page. (Clear the Pages Menu by pressing EXIT.)

Pages Menu, showing sonar display options.

Satellite Status Page

The Satellite Status Page provides detailed information on the status of

the unit's satellite lock-on and position acquisition. To get to the

Satellite Status Page: Press the PAGES key, then use →

→

→→ or ← to select

STATUS. (Clear the Pages Menu by pressing EXIT.)

This page represents a GPS function, so it is discussed in much greater

detail in Sec. 6.

No matter what Page you are on, a flashing current position

indicator/question mark symbol and flashing GPS data displays

indicate that satellite lock has been lost and there is no position

confirmed.

WARNING:

Do not begin navigating with this unit until the numbers

have stopped flashing!

Satellite Status Page.

Navigation Page

This screen has a compass rose that not only shows your direction of

travel, but also the direction to a recalled waypoint. To get to the

Navigation Page: Press PAGES| →

→

→→ or ← to NAVIGATION|EXIT.

This page represents a GPS function, so it is discussed in much greater

detail in Sec. 6.

The Navigation Page (left); navigation with sonar (right).

Map Page

The Map Page screens show your course and track from a "bird's-eye"

view, on a moving map. By default, this unit shows the map with north

always at the top of the screen. The arrow in the center of the screen is

your present position. It points in the direction you're traveling.

Map Page, showing position on Bull Shoals Lake, Arkansas. The full

map option (left). Map with sonar option (right).

Map Page is the default screen that appears when you turn on the unit.

To get to the Map Page from another page: Press PAGES| →

→

→→ or ← to

MAP|EXIT.

You can display a split screen showing both the Map and Sonar pages

at the same time. This feature is discussed in Sec. 4, Sonar Options &

Other Features.

The Map Page represents a GPS function, so it is discussed in much

greater detail in Sec. 6.

Sonar Page

The Sonar Page displays the sonar chart. This is a "cross-section" view

of the water column beneath the boat. The chart moves across the

screen, displaying sonar signal echoes that represent fish, structure

and the bottom.

To get to the Sonar Page: Press the PAGES key, then use →

→

→→ or ← to

select SONAR. (Clear the Pages Menu by pressing EXIT.) The Pages Menu

offers five chart display options under the Sonar Page category. To access

them, press PAGES|←

←

←← or→

→

→→ to SONAR|↓

↓

↓↓ to Option Name| .EXIT

The Sonar Page has its own menu, which is used for advanced functions

and for setting various options. (Sonar Options and other features are

discussed in Sec. 4.) To Access the Sonar Page menu, from the Sonar

Page press MENU.

Pages Menu, showing sonar chart display option commands (left).

Sonar Page in full sonar chart display mode (right).

Sonar chart display options (from left) split zoom and split frequency.

Sonar chart display options (from left) digital data and FlashGraf .





Sonar Page Menu. Most of these functions are discussed in Sec. 4.

Sonar Page, showing full sonar chart mode.

You can customize how the Sonar Page displays its pictures and other data

in many ways. Your unit also includes several special sonar features and

options that can help you better interpret the underwater scene.

We'll discuss all of those features and options in Sec. 4, but to show you

how easy the unit is to operate, the following page contains a simplified,

10-step quick reference that will cover most fish finding situations. The

quick reference describes how your unit will operate with all the sonar

features in their automatic modes, which are set at the factory.

Surface clutter

Structure

Bottom signal

Fish arches

In FasTrack, fish

arches show as

horizontal bars.

Depth scale

Digital data

overlay

(depth &

temperature)

Surface signal

Zoom bar

FasTrack

bar graph

LCX-20C Sonar Quick Reference

1. Mount the transducer, antenna and unit. Connect the unit to electric

power and the transducer. (If GPS operation is desired, connect GPS

antenna, too.) Make sure the MMC is in. (See complete installation

details beginning on page 11.)

2. Launch your boat.

3. To turn on the unit, press and release PWR key.

4. Opening screen displays Map Page. Rotate through the four main

Page screens (Map Page, Satellite Status Page, Navigation Page, Sonar

Page) by pressing PAGES| |

←

←← or →

→

→→ to select Page Name EXIT. Switch

Pages to display Sonar Page.

5. If GPS data is desired, wait while unit locates satellites and calculates

current position. When the unit acquires position, a tone sounds and a

position acquired message appears.

6. With position acquired (if desired), head for your fishing grounds.

Your unit will automatically display digital depth and surface water

temperature in the top left corner of the screen.

The auto settings will track the bottom, displaying it in the lower

portion of the screen. The full sonar chart will scroll from right to left,

showing you what's under the boat as you cruise across the water. You

can change the display by:

Zoom in to enlarge the chart for more detail: press ZIN.

Zoom out to return to full chart mode: press ZOUT.

7. Watch the display for the appearance of fish arches. When you see

arches, you've found fish! Stop the boat and get your lure or bait into

the water at the depth indicated on the sonar chart.

8. Gauge the fish depth by visually comparing the fish arches with the

depth scale on the right side of the screen, or get a more accurate

measure with the Depth Cursor. Press MENU|↓

↓

↓↓ to D CEPTH URSOR|ENT.

Press ↓

↓

↓↓ to align the cursor line with the fish arch. The exact depth

appears in a box at the right end of the cursor line. To clear the cursor,

press EXIT.

9. If you are drifting at a very low speed or anchored, you are not

moving fast enough for a fish to return the tell-tale fish arch signal. As

you drift over a fish, or as a fish swims through the transducer's signal

cone, the fish echo will appear as a straight line suspended between the

surface and the bottom.

10. To turn off the unit, press and hold PWR key for three seconds.

Sonar Operations

As you can see from the quick reference on the previous page, basic operation

is pretty easy, right out of the box. If you are a sonar novice, try operating the

unit with the factory defaults until you get a feel for how it's working.

As you're learning the basics, there is one setting you might want to tinker

with from time to time — Sensitivity.

Sensitivity controls the unit's ability to pick up echoes. If you want to see

more detail, try increasing the sensitivity, a little at a time. There are

situations when too much clutter appears on the screen. Decreasing the

sensitivity can reduce the clutter and show the strongest fish echoes, if fish

are present. As you change the sensitivity setting, you can see the difference

on the chart as it scrolls.

These figures show results of different sensitivity levels on the same

location. Fig. 1: Sensitivity at 88 percent. Typical of full auto mode. Fig.

2: Sensitivity set at 75 percent. Fig. 3: Sensitivity set at 50 percent. Fig.

4: Sensitivity set at 100 percent.

You can change the sensitivity level whether you are in Auto

Sensitivity mode or Manual Sensitivity mode. The adjustment method

works the same in both modes, but gives you slightly different results.

Fig. 1 Fig. 2

Fig. 3 Fig. 4

Adjusting sensitivity in Auto Sensitivity Mode is similar to manually

adjusting a car's speed with the accelerator pedal while cruise control is

on. You can tell the car to run faster, but when you let off the gas the

cruise control automatically keeps you from running slower than the

minimum speed setting. In this unit, auto mode will let you increase

sensitivity to 100 percent, but the unit will limit your setting.minimum

This prevents you from turning sensitivity down too low to allow

automatic bottom tracking. When you change the setting with auto

turned on, the unit will continue to track the bottom and make minor

adjustments to the sensitivity level, with a bias toward the setting you

selected.

Adjusting sensitivity in Manual Sensitivity Mode is similar to driving a

car without cruise control — you have complete manual control of the

car's speed. In this unit, manual mode allows you to set sensitivity at

100 percent (maximum) or zero percent (minimum.) Depending on

water conditions, the bottom signal may completely disappear from the

screen when you reduce sensitivity to about 50 percent or less!

Try adjusting sensitivity in both auto and manual modes to see how

they work.

To adjust sensitivity:

1. Press MENU|ENT.

2. The Sensitivity Control Bar appears. Press ↓

↓

↓↓ to decrease sensitivity;

press ↑

↑

↑↑ to increase sensitivity. When it's set at the desired level, press

EXIT. (When you reach the maximum or minimum limit, a tone sounds.)

Sonar Menu with Sensitivity command selected (left). The Sensitivity

Control Bar (right).

NOTE:

If you want to change the sensitivity in Manual Mode, first turn off

Auto Sensitivity: from the Sonar Page, press MENU|↓

↓

↓↓ to AUTO

S SENSITIVITY|ENT|↑

↑

↑↑ to ENSITIVITY|ENT. Press ↓

↓

↓↓ ↑

↑

↑↑ or to pick a different

sensitivity setting. When it's set at the desired level, press EXIT.

Important Tip:

While you are experimenting and learning, it's possible to scramble

the settings so that the sonar picture disappears from your screen.

If that happens, remember that it's easy to switch back to full

automatic operation by simply restoring the factory auto settings.

Here's how:

To Restore Factory Settings

1. Press MENU| | | |MENU ↓

↓

↓↓ to S SYSTEM ETUP ENT ↓

↓

↓↓ to RESET

OPTIONS|ENT.

2. The unit asks if you want to reset all the options. Press ←

←

←← to

YES|ENT. All options are reset, and the unit reverts back to the Map

Page at the 4000-mile zoom range. (Any recorded sonar logs or GPS

data will be unchanged.)

Fish Symbols vs. Full Sonar Chart

You may have noticed in the quick reference that we used fish arches in

full sonar chart mode for our example, and not the popular Fish I.D.

fish symbol feature. Here's why.

Fish I.D. is an easier way for a sonar novice to recognize a fish signal

return when he sees it. However, locating a fish via symbol has some

limitations.

Your sonar unit's microprocessor is remarkably powerful, but it can be

fooled. Some of the echoes calculated to be fish could be tree limbs or

turtles! To see what's under your boat in maximum detail, we

recommend you turn off Fish I.D. and begin learning to interpret fish

arches.

Fish I.D. is most handy when you're in another part of the boat or

performing some task that prevents you from watching the sonar

screen. Then, you can turn on Fish I.D. and the audible fish alarm.

When that lunker swims under your boat, you'll hear it!

Fish I.D. can also be useful when you want to screen out some of the

sonar detail gathered by your unit. For example, in one case, fisherman

in San Francisco Bay saw clouds of clutter in the water but no fish

arches. When a downrigger was pulled up, it brought up several small

jellyfish. The fisherman switched their Lowrance sonar to Fish I.D.,

which screened out the schools of jellyfish and clearly showed the game

fish there as fish symbols.

Other Free Training Aids

The sonar options section discusses Fish I.D., fish alarms and other

features in greater detail. If you or a friend has Internet access, you can

also learn more about interpreting what you see on your sonar screen.

Visit our web site, www.lowrance.com. Be sure to check out the free

Sonar Tutorial, which includes animated illustrations and more

pictures of actual sonar returns, all described in detail. There's even a

"printer friendly" version of the tutorial available on our web site…it

makes a great supplement to this operation manual!

You can also download a free copy of our Sonar Viewer software. This

PC-based software application plays back any sonar chart log recorded

with a Lowrance sonar product. Features include:

• Adjustable range, zoom, sensitivity, color line, noise rejection,

surface clarity, etc. of the recorded file.

• Color interpretation of sonar signals can be user defined.

• Operates like a Windows Multimedia Player with forward,

reverse, pause, fast forward, fast reverse, and scroll buttons.

• Adjustments update the entire record displayed

• Can print in full color.

• Window can dynamically be sized on your monitor.

• Mouse cursor shows GPS position, depth and sounding number

anywhere on the visible record.

For the ultimate training aid, be sure to download the free emulator

software for your unit. Aside from being just plain fun, this program

can help you learn both basic and advanced operations without burning

boat fuel! Lowrance is the first sonar manufacturer to provide this type

of training tool for customers.

This PC application simulates the actual sonar/GPS unit on your

computer. You can run it from your computer keyboard or use your

mouse to press the virtual keys. Easy download and installation

instructions are available on our web site.

A free training emulator is available for your unit on our web site.

The emulator works exactly like your real sonar/GPS unit. Using the

Sonar Simulator and GPS Simulator features, it allows you to play

back sonar logs, run GPS routes and trails, even create real waypoints

you can use in the field! You can even take snapshots of the Sonar

Chart and print them or e-mail them to friends.

Section 4:

Sonar Options & Other Features

Material in this section is arranged in alphabetical order.

ASP



 (Advanced Signal Processing)

The ASP feature is a noise rejection system built into the sonar unit

that constantly evaluates the effects of boat speed, water conditions

and interference. This automatic feature gives you the best display

possible under most conditions.

The ASP feature is an effective tool in combating noise. In sonar terms,

noise is any undesired signal. It is caused by electrical and mechanical

sources such as bilge pumps, engine ignition systems and wiring, air

bubbles passing over the face of the transducer, even vibration from the

engine. In all cases, noise can produce unwanted marks on the display.

The ASP feature has four settings — Off, Low, Medium and High. If

you have high noise levels, try using the "High" ASP setting. However,

if you are having trouble with noise, we suggest that you take steps to

find the interference source and fix it, rather than continually using the

unit with the high ASP setting.

There are times when you may want to turn the ASP feature off. This

allows you to view all incoming echoes before they are processed by the

ASP feature.

Sonar Menu with Sonar Features selected (left). The Sonar Features

menu (right), Noise Rejection selected with ASP at default low setting.

To change the ASP level:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press ↓

↓

↓↓ to NOISE REJECTION|ENT.

3. Press ↓

↓

↓↓ or ↑

↑

↑↑ to select a setting, then press ENT.

4. To return to the previous page, press EXIT EXIT| .

Alarms

This unit has three different types of sonar alarms. The first is the Fish

Alarm. It sounds when the Fish I.D. feature determines an echo is a

fish.

Another alarm is the Zone Alarm, which consists of a bar on the side of

the screen. Any echo on the chart that appears inside this bar triggers

the alarm.

The last alarm is the Depth Alarm, which has both a Shallow and a

Deep setting. Only the bottom signal will trigger this alarm. This is

useful as an anchor watch, a shallow water alert, or for navigation.

Depth Alarms

The depth alarms sound a tone when the bottom signal goes shallower

than the shallow alarm's setting or deeper than the deep alarm's

setting. For example, if you set the shallow alarm to 10 feet, the alarm

will sound a tone if the bottom signal is less than 10 feet. It will

continue to sound until the bottom goes deeper than 10 feet.

The deep alarm works just the opposite. It sounds a warning tone if the

bottom depth goes deeper than the alarm's setting. Both depth alarms

work only off the digital bottom depth signals. No other targets will trip

these alarms. These alarms can be used at the same time or individually.

Main Menu and Sonar Alarms command (left);

The Sonar Alarms menu (right).

To adjust and turn on the shallow alarm:

↓

↓↓ to ALARMS ENT ↓

↓

↓↓ to S AONAR LARMS ENT

2. Press →

→

→→ to S A DHALLOW LARM EPTH|ENT.

3. Press ↑

↑

↑↑ or ↓

↓

↓↓ to change the first number, then press →

→

→→ to move the

cursor to the next number and repeat until the depth is correct, then

press ENT.

4. Press ←

←

←← to S A EHALLOW LARM NABLED|ENT|EXIT|EXIT|EXIT.

5. To turn off the alarm, press MENU MENU| |↓

↓

↓↓ to ALARMS|ENT|↓

↓

↓↓ to

To switch to a different depth setting, open the Sonar Alarms menu and

repeat the instructions in step 3 above.

To adjust and turn on the deep alarm:

↓

↓↓ to ALARMS ENT ↓

↓

↓↓ to S AONAR LARMS ENT

2. Press ↓ to D A E D A DEEP LARM NABLED|→

→

→→ to EEP LARM EPTH|ENT.

3. Press ↑

↑

↑↑ or ↓

↓

↓↓ to change the first number, then press →

→

→→ to move the

cursor to the next number and repeat until the depth is correct, then

press ENT.

4. Press ←

←

←← to D A EEEP LARM NABLED|ENT|EXIT|EXIT|EXIT.

5. To turn off the alarm, press MENU MENU| |↓

↓

↓↓ to ALARMS|ENT|↓

↓

↓↓ to

S A D A EONAR LARMS|ENT|↓

↓

↓↓ to EEP LARM NABLED|ENT|EXIT|EXIT|EXIT.

To switch to a different depth setting, open the Sonar Alarms menu and

repeat the instructions in step 3 above.

Zone Alarm

The zone alarm is triggered when any echo passes inside the zone

alarm bar, shown on the right side of the screen.

To adjust and turn on the zone alarm:

↓

↓↓ to ALARMS ENT ↓

↓

↓↓ to S AONAR LARMS ENT

2. Press ↓

↓

↓↓ to Z A E A ZONE LARM NABLED|→

→

→→ to DJUST ONE|ENT.

Sonar Alarms menu, with Adjust Zone command selected (left); Adjust

Zone Alarm selection box, with Upper Limit selected (right).

3. To set the upper boundary for the Zone Alarm, use ←

←

←← or to select

→

→→

UPPER, then press or

↑

↑↑ ↓

↓

↓↓ to move the top of the bar to the desired depth.

4. To set the lower boundary for the Zone Alarm, use ←

←

←← or→

→

→→ to select

LOWER, then press ↑

↑

↑↑ ↓

↓

↓↓ or to move the bottom of the bar to the desired

depth.

5. Press EXIT EXIT EXIT EXIT|←

←

←← to Z A EONE LARM NABLED|ENT| | | . Now, any

echo — fish, bottom, structure — within the zone alarm's depth range

will trigger the zone alarm.

6. To turn off the alarm, press MENU MENU| |↓

↓

↓↓ to ALARMS|ENT|↓

↓

↓↓ to

S A Z A EONAR LARMS|ENT|↓

↓

↓↓ to ONE LARM NABLED|ENT|EXIT|EXIT|EXIT.

To switch to a different depth setting, open the Sonar Alarms menu and

repeat the instructions in steps 3 and 4 above.

Fish Alarm

Use the fish alarm for a distinctive audible alarm when fish or other

suspended objects are detected by the Fish I.D. feature (Fish I.D.

must be turned on for the Fish Alarm to work). A different tone sounds

for each fish symbol size shown on the display.

Sonar Alarms menu with Fish Alarm selected. The checkbox is blank,

indicating the alarm is turned off.

To turn the ﬁsh alarm on:

↓

↓↓ to ALARMS ENT ↓

↓

↓↓ to S AONAR LARMS ENT

2. Press ↓ to F AISH LARM|ENT|EXIT|EXIT|EXIT.

3. To turn off the alarm, press MENU MENU| |↓

↓

↓↓ to ALARMS|ENT|↓

↓

↓↓ to

S A F AONAR LARMS|ENT|↓

↓

↓↓ to ISH LARM|ENT|EXIT|EXIT|EXIT.

Calibrate Speed

The speed sensor can be calibrated to compensate for inaccuracies.

Before you change the setting, first calculate the percentage that the

speed is off. You will enter this percentage in a moment.

For example, if you figure the sensor is reading 10 percent faster than

actual speed, you will enter – 10 in the calibration window. If the

sensor is reading 5 percent slower than true speed, you will enter + 5 in

the window.

A good way to gauge your speed sensor's performance is to compare its

reading with the ground speed measured by your unit's GPS functions.

When you make a run to compare GPS ground speed to speed sensor

speed, perform your test in relatively calm water free of current, if

possible. (Unless, of course, you are taking the current speed into

consideration when making your calculation.) After you have a

correction figure, here's how to enter it:

1. Press MENU MENU| |↓

↓

↓↓ to S S C WONAR ETUP|ENT|↓

↓

↓↓ to ALIBRATE ATER

SPEED|ENT.

2. Enter the number you calculated earlier: press ↑

↑

↑↑ or ↓

↓

↓↓ to change the

first character (+ or –), then press →

→

→→ to move the cursor to the next

number and repeat until the percentage is correct, then press

EXIT.

Chart Speed

The rate echoes scroll across the screen is called the chart speed. The

default is maximum. We recommend you leave the setting there for

virtually all fishing conditions.

You, however, might consider experimenting with chart speed when

you are stationary or drifting very slowly. You may sometimes achieve

better images as you slow the chart speed to match how fast you are

moving across the bottom.

If you are at anchor, ice fishing or fishing from a dock, experiment with

a chart speed around 50 percent. If you are drifting slowly, try a chart

speed around 75 percent. When you are stationary and a fish swims

through the sonar signal cone, the image appears on the screen as a

long line instead of a fish arch. Reducing the chart speed may result in

a shorter line that more closely resembles a regular fish return.

Sonar Page menu with Chart Speed command selected (left);.

The Chart Speed Control Bar (right).

If you do experiment with chart speed, remember to reset it to

maximum when you resume trolling or moving across the water at

higher speed. To change chart speed:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to C SHART PEED|ENT.

2. The Chart Speed Control Bar appears. Press ↓

↓

↓↓ to decrease chart

speed; press ↑

↑

↑↑ to increase chart speed.

3. When it's set at the desired level, press EXIT.

ColorLine





ColorLine lets you distinguish between strong and weak echoes. It

"paints" a brighter color on targets that return a stronger signal. This

allows you to tell the difference between a hard and soft bottom. For

example, a soft, muddy or weedy bottom returns a weaker signal, which

is shown with a narrow, colored line (dark blue tinged with red or a

little yellow.) Since fish are among the weakest echoes, they show up

mostly as blue arches. A hard bottom or other relatively hard target

returns a strong signal displayed as a wide, brightly colored line

(reddish yellow to bright yellow.)

If you have two signals of equal size, one with red to yellow color and

the other without, then the target with brighter color (yellow) is the

stronger signal. This helps distinguish weeds from trees on the bottom,

or fish from structure.

ColorLine is adjustable. Experiment with your unit to find the

ColorLine setting that's best for you.

Sonar Page menu with ColorLine command selected (left);.

The ColorLine control bar (right).

To adjust the ColorLine level:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to COLORLINE|ENT.

2. The ColorLine Control Bar appears. Press ↓

↓

↓↓ to decrease ColorLine;

press ↑

↑

↑↑ to increase Colorline.

3. When it's set at the desired level, press EXIT.

The "A" figures to the left show locations with ColorLine set at the

factory level of 70 percent. The "B" figures on the right show the same

locations with ColorLine increased to 84 percent. In Figure 1B, no fish

are near the left structure, but the right structure shows fish holding

next to the structure.

Depth Cursor

The depth cursor consists of a horizontal line with a digital depth box on

the right side. The numbers inside the box show the depth of the cursor.

ColorLine

Muddy

bottom

Hard

bottom

Muddy

bottom

Fish near

structure

Hard

bottom

Hard

structure

Colorline

Fig. 2A

Fig. 3A

Fig. 2B

Fig. 3B

Fig. 1A Fig. 1B

Sonar Page menu with Depth Cursor command selected (left). Sonar

chart with the depth cursor active (right). The line indicates the large

fish is 21.95 feet deep.

The cursor can be moved to any location on the screen, letting you

pinpoint the depth of a target.

1. From the Sonar Page, press MENU|↓

↓

↓↓ to D CEPTH URSOR|ENT.

2. The depth cursor appears. Press ↓

↓

↓↓ to lower the cursor line; press ↑

↑

↑↑ to

raise the cursor line.

3. To clear the depth cursor, press EXIT.

Depth Range - Automatic

When turned on for the first time, the bottom signal is automatically

placed in the lower half of the screen. This is called Auto Ranging and

is part of the automatic function. You can change the range to a

different depth, depending upon the bottom depth and the current

range. To do this:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to D REPTH ANGE|ENT.

Sonar Page menu with Depth Range command selected (left); The

Depth Range Control Scale (right).

Cursor line Depth box

2. The Depth Range Control Scale appears. Press ↑

↑

↑↑ or ↓

↓

↓↓ to select a

different depth range. A blue bar highlights the selected range. The

lighter range numbers can not be selected.

3. When the new range is selected, press EXIT to clear the menu.

Depth Range - Manual

You have complete control over the range when the unit is in the

manual mode. There are 16 depth ranges, from 5 to 4,000 feet.

To switch to Manual Depth Range:

1. First, turn off automatic depth range. From the Sonar Page, press

MENU|↓

↓

↓↓ to A D RUTO EPTH ANGE|ENT.

2. Press ↑

↑

↑↑ to D REPTH ANGE|ENT and the Depth Range Control Scale appears.

3. Press ↓

↓

↓↓ or ↑

↑

↑↑ to select a different depth range. A horizontal blue bar

highlights the selected range.

4. When the new range is selected, press EXIT to clear the menu.

To turn Auto Depth Range on again:

From the Sonar Page, press |MENU|↓

↓

↓↓ to A D RUTO EPTH ANGE ENT|EXIT.

NOTE:

The sonar's depth capability depends on the transducer

installation, water and bottom conditions, and other factors.

Depth Range - Upper and Lower Limits

Virtually any segment of the water column can be displayed by using

the upper and lower limit feature. This lets you pick the shallow and

deep range limits shown on the screen, provided there is at least 10 feet

between the upper and lower limit you select. For example, a range

from 12 feet to 34 feet could be used.

Changing the upper and lower limits gives you far greater control over

the depth range. This feature lets you "zoom in" the display in almost

unlimited combinations. Nearly any segment of the water column, from

the surface to the bottom can be shown. This enlarges the sonar targets

to best suit your fishing needs and water conditions.

conditions directly under the boat. This makes it useful for ice fishing,

or when you're fishing at anchor. When the boat is not moving, fish

signals are long, drawn out lines on a normal chart display. FasTrack

converts the graph to a vertical bar graph that, with practice, makes a

useful addition to fishing at a stationary location.

Sonar Page showing FasTrack.

Fish I.D.



 (Fish Symbols & Depths)

The Fish I.D. feature identifies targets that meet certain conditions as

fish. The microcomputer analyzes all echoes and eliminates surface

clutter, thermoclines, and other undesirable signals. In most instances,

remaining targets are fish. The Fish I.D. feature displays fish symbols

on the screen in place of the actual fish echoes.

There are several fish symbol sizes. These are used to designate the

relative size between targets. In other words, Fish I.D. displays a small

fish symbol when it recognizes a target as a small fish, a medium fish

symbol on a larger target and so on.

The sonar's microcomputer is sophisticated, but it can be fooled. It can't

distinguish between fish and other suspended objects such as trotlines,

turtles, submerged floats, air bubbles, etc. Individual tree limbs

extending outwards from a group of limbs is the hardest object for the

Fish I.D. feature to distinguish from fish.

You may see fish symbols on the screen when actually, there are no

fish. The reverse also is true.

Does that mean Fish I.D. is broken? No. The feature is simply

interpreting sonar returns in a specific way to help take some of the

work out of reading the screen. Remember: Fish I.D. is one of the many

tools we provide so you can analyze your sonar returns for maximum

fish finding information. This and other features can help you

successfully "see" beneath the boat under varied water and fishing

conditions. Practice with Fish I.D. mode on and off to become more

familiar with it. The default for Fish I.D. is off.

Structure

Colorline 





Bottom signal

Fish arches

FasTrack,

fish arches

show as

horizontal

bars.

FasTrack

bar graph

The Sonar Features menu.

To turn the Fish I.D. feature on:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press →

→

→→ to F SISH YMBOLS|ENT|EXIT|EXIT.

To turn off Fish I.D., repeat the instructions in step 1.

Figures 1A and 2A (left) show Sonar Page in normal chart mode. Figures

1B and 2B (right) show the same underwater scene with Fish I.D. turned

on. Note how arches are replaced with symbols.

Fish arches

above structure

No fish shown

Fig. 1 A Fig. 1 B

Fig. 2 A Fig. 2 B

Many fish

arches visible

Fewer fish

symbols visible

Fish symbols appear

in surface clutter

There is a common exception to these rules of thumb. Some fishermen

on freshwater lakes (or the ocean) using downriggers like to see them

on the sonar. In many of those cases, you'll see a 50 kHz transducer

frequency in use because the wider cone angle lets them watch the bait.

Sonar Features menu with a frequency of 200 kHz selected.

To change the frequency setting to 50 kHz:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press →

→

→→ ↓

↓

↓↓ to 50 K ZH|ENT.

3. Press EXIT EXIT| to clear the menu.

To change the frequency setting to 200 kHz:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press→

→

→→ ↓

↓

↓↓ to 200 K ZH| .ENT

3. Press EXIT EXIT| to clear the menu.

HyperScroll





See the entry on Ping Speed, which controls the HyperScroll feature.

Log Sonar Chart Data

If you have an MMC installed in the unit, the sonar data shown on the

screen can be saved to it. This can be played back at any time. (To play

a recorded sonar chart log, see the entry in this section for Sonar

Simulator.) If you have a personal computer and internet access,

download our free Sonar Viewer and your unit’s emulator at our web

site, www.lowrance.com. That will allow you to replay sonar logs on

your personal computer.

The Sonar Page menu with the Log Sonar Chart Data command

selected (left). Sonar Chart Logging menu, with the Start Logging

command selected (right). The MMC has 11.7 MB of free space, which

will record the scrolling chart for 20 minutes and 44 seconds.

To record or log chart data:

1. Press MENU|↓

↓

↓↓ to L S C DOG ONAR HART ATA|ENT.

2. To record data using the default settings, press ENT. The menu clears

and the Sonar Page title bar shows the name of the file you are

recording. Warning messages will appear as recording time begins to run

out.

NOTE:

You can change any of the settings by using the cursor arrows to

highlight different commands. Select F NILE AME if you want to

change the name. Select C QHART UALITY if you want to lower the file

quality and record for a longer period of time. After you've changed

the settings, select S LTART OGGING.

Noise Rejection

See the entry on Advanced Signal Processing in this section.

Overlay Data

On any Page display except Satellite Status, you can "float" or overlay

additional Sonar or data on the screen with the Overlay Data

command. The various data available from your unit are divided into

categories in the Overlay Data menu. These categories include GPS

Data, Navigation, Trip Calculator, Time, Sonar Data and

Miscellaneous Data.

You can select items from any of these categories for display, in any

combination. The category divisions are there only to help you sort

through the information.

The overlay data on this sonar display includes, Depth, Temperature,

Ground Speed and the Track the boat is following.

NOTE:

Some data types can be displayed in only one font size. If that is the

case, the Data Size box will not be displayed for that data type.

Ping Speed & HyperScroll





Ping Speed controls the rate at which the transmitter and transducer

broadcast sonar sound waves — pings — into the water. The unit has a

default ping speed of 50 percent. At normal boating speeds, this

automatically provides enough return echoes to refresh the screen and

scroll the chart at maximum chart speed.

However, when you are running at high speeds, or just want the fastest

possible screen update, you may want to use the HyperScroll feature.

When you change the Ping Speed to any setting greater than 50

percent, the unit automatically enters HyperScroll mode.

These faster ping rates allow you to maintain a high-detail picture on

the screen, and the screen refresh rate and chart scroll speed can keep

pace with the boat as it moves quickly over the bottom terrain.

When using HyperScroll, you may also need to manually decrease the

sensitivity for optimum performance. Depending on water depth and

other conditions, HyperScroll may cause a second bottom echo to return

to the transducer during the next ping cycle, or sounding. This can result

in a large amount of clutter appearing on the screen. If this occurs, just

decrease the sensitivity to a level that eliminates the clutter. When you

turn HyperScroll off, you can return to your original sensitivity level.

Sonar Menu with Ping Speed command selected (left).

The Ping Speed Control Bar (right) at default setting.

To change Ping Speed:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to P SING PEED|ENT.

2. The Ping Speed Control Bar appears. Press ↑

↑

↑↑ to increase ping speed;

press ↓

↓

↓↓ to decrease ping speed. When it's set at the desired level, press EXIT.

To turn off HyperScroll:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to P SING PEED|ENT.

2. The Ping Speed Control Bar appears. Press ↓

↓

↓↓ to decrease ping speed

to 50 percent. When it's set at the desired level, press EXIT.

When you boost ping speed and switch into HyperScroll, the width of

the FasTrack bar graph display doubles in width at the right side of the

screen. This allows you to better see the virtually instantaneous sonar

returns, just as you would on a flasher sonar unit. For more

information on FasTrack, see it's entry in this section.

Reset Options

This command is used to reset all features, options and settings to their

original factory defaults. This is useful when you have changed several

settings and want to return the unit to basic automatic operation.

1. Press MENU MENU| |↓

↓

↓↓ to S S R OYSTEM ETUP|ENT|↓

↓

↓↓ to ESET PTIONS|ENT.

2. Press ←

←

←← to YES|ENT.

3. All the menus are cleared and the unit reverts to the Map Page at

the 4000-mile zoom range, just as if you had turned it on for the first

time. All options have been returned to the factory settings.

Automatic Sensitivity

The default sensitivity mode is automatic. The unit bases the

sensitivity level on water depth and conditions. When the unit is in the

automatic mode, sensitivity is automatically adjusted to keep a solid

bottom signal displayed, plus a little more power. This gives it the

capability to show fish and other detail.

However, situations occur when it becomes necessary to increase or

decrease the sensitivity. This typically happens when you wish to see

more detail, so an increase in sensitivity is indicated. Or, wave action

and boat wakes can create enough tiny air bubbles to clutter much of

the water column. In that case, a decrease in sensitivity is indicated to

reduce some of the clutter.

The control bar used to adjust sensitivity up or down is the same

whether the unit is in the automatic or manual mode. In automatic you

can adjust sensitivity up to 100 percent but the unit will limit your

minimum setting. In auto, the unit will continue to make small

adjustments, allowing for the setting you selected.

In manual mode, you have complete control over sensitivity, with the

ability to set it anywhere from zero to 100 percent. Once you select a

level in manual, the unit will continue to use that exact sensitivity

setting until you change it or revert to auto mode.

To adjust sensitivity in auto mode:

1. Press MENU|ENT.

2. The Sensitivity Control Bar appears. Press ↓

↓

↓↓ to decrease sensitivity;

press ↑

↑

↑↑ to increase sensitivity. When it's set at the desired level, press

EXIT. (When you reach the maximum or minimum limit, a tone sounds.)

Sonar Menu with Sensitivity command selected (left).

The Sensitivity Control Bar (right).

To adjust sensitivity in manual mode:

1. First, turn off Auto Sensitivity: from the Sonar Page, press MENU|↓

↓

↓↓

to A SUTO ENSITIVITY|ENT.

2. Press ↑

↑

↑↑ to SENSITIVITY|ENT and the Sensitivity Control Bar appears.

Press ↓

↓

↓↓ or ↑

↑

↑↑ to pick a different sensitivity setting. When it's set at the

desired level, press EXIT.

To turn Auto Sensitivity back on:

From the Sonar Page, press MENU|↓

↓

↓↓ to A SUTO ENSITIVITY|ENT|EXIT.

NOTE:

To return to the original factory setting for Auto Sensitivity, see the

entry in this section on Reset Options. If sensitivity is in manual

mode, the Reset Options command will switch back to Auto and

reset the factory setting at the same time.

Tip:

For quicker sensitivity adjustments, try leaving the Sensitivity

Control Bar on the screen as the chart scrolls. You can see the

changes on the screen as you press the up or down arrows. This is

handy when there's a lot of clutter in the water, and you are

matching the sensitivity to rapidly changing water conditions.

Sonar Chart Mode

The default color scheme for the sonar chart is white background, but

we offer other variations to suit your viewing preferences. The chart

can be displayed in grayscale, reverse grayscale, blue background,

nightview, iceview or bottom color tracking.

To change the chart mode:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2.. Press →

→

→→ ↓

↓

↓↓ to S C MONAR HART ODE|ENT.

3. Press ↓

↓

↓↓ or ↑

↑

↑↑ to Mode Name| .ENT

4. Press EXIT EXIT| to return to the Sonar Page.

Sonar Page & Sonar Chart Display Options

The Pages Menu offers five chart display options for units with dual-

frequency transducers and four options for units with single-frequency

transducers. To access them, press PAGES|←

←

←← or→

→

→→ to SONAR|↓

↓

↓↓ to Option

Name | .EXIT

Pages Menu, showing sonar chart display options.

Full Sonar Chart

This is the default mode used when the unit is turned on for the first

time or when it's reset to the factory defaults.

The bottom signal scrolls across the screen from right to left. Depth

scales on the right side of the screen aid in determining the depth of

targets. The line at the top of the screen represents the surface. The

bottom depth and surface temperature (if equipped with a temperature

sensor or a transducer with a temp sensor built in) show at the top left

corner of the screen.

The FasTrack™ display shows just to the right of the scale. This

changes all echoes into short horizontal bars, replicating a flasher

sonar. The zoom bar on the far right shows the area that's zoomed

when the zoom is in use. (See the Zoom section on page 89 for more

information.)

Full Sonar Chart. The Overlay Data (depth and water temperature)

are each set to a different text size.

Trip Calculator, Time, Sonar and Miscellaneous Data You can select

items from any of these categories for display in any data box. The

category divisions are only there to help you sort through the

information.

To change information displayed in a data box:

On the page with the digital data box you wish to change, press

MENU|↓

↓

↓↓ to CUSTOMIZE|ENT. A data box name flashes, indicating it is

selected. Press ENT to modify the box or hit ↑

↑

↑↑ or ↓

↓

↓↓ to select another box,

then press ENT. You'll see a list of categories with "+" or "–" symbols

next to each category. A category with a "+" is expandable, meaning its

contents are hidden.

Data Viewer with the Sonar Data category expanded.

Selecting the category name and pressing ENT will show the category's

contents, so you can choose items within it. An expanded category (one

with a "–" next to its name) can be collapsed to hide its contents. Just

select the category name and press ENT.

Expand any categories that might contain data you want to display.

Then press ↓

↓

↓↓ or ↑

↑

↑↑ to select a different data option. With the new option

highlighted, press ENT to switch the contents of the box to the new data

type, then press EXIT. You can now select another box to change. When

you are finished with the settings, press EXIT again and the box name

stops flashing.

NOTE

A Page display can only show a limited number of data boxes.

FlashGraf

The FlashGraf sonar page option represents a flasher style sonar

combined with a scrolling chart. A circular dial shows all returning

echoes at a high screen refresh rate. It uses the Colorline feature to

Sonar Menu with Stop Chart command selected. The box is unchecked,

indicating the chart is scrolling across the screen.

Surface Clarity

The markings extending downward from the zero line on the chart are

called "surface clutter." These markings are caused by wave action,

boat wakes, temperature inversion and more.

The surface clarity control reduces or eliminates surface clutter signals

from the display. It does this by changing the sensitivity of the receiver,

decreasing it near the surface and gradually increasing it as the depth

increases.

There are three levels of surface clarity available: low, medium, or high.

It can also be turned off. The default level is off.

To adjust the Surface Clarity level:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

Sonar Features menu with Surface Clarity selected.

2. Press ↓

↓

↓↓ to S CURFACE LARITY|ENT.

3. Press ↓

↓

↓↓ ↑

↑

↑↑ or to select clarity level| | | .EXIT EXIT EXIT

Notes

Produktspecifikationer

Varumärke:	Lowrance
Kategori:	Inte kategoriserad
Modell:	LCX-20C

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