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LCX-20C
Fish-finding Sonar & Mapping GPS
Operation Instructions
Copyright © 2004 Lowrance Electronics, Inc.
All rights reserved.
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.
i
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
ii
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
iv
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
v
Port Information ................................................................... 151
Tidal Current Information ................................................... 152
Tide Information ................................................................... 154
Pop-up Help............................................................................... 156
Reset Options............................................................................ 156
Screen Contrast and Brightness .............................................. 157
Once in the Screen menu:................................................. 157
Set Language ............................................................................ 158
Set Local Time .......................................................................... 158
Once in the Time Settings menu:..................................... 158
Show WAAS Alarm................................................................... 159
Software Version Information.................................................. 160
Sounds and Alarm Sound Styles.............................................. 160
Once in the Sounds menu................................................. 160
Track Smoothing....................................................................... 161
Trail Options ............................................................................. 161
General Trail Options....................................................... 161
Delete All Trails.................................................................... 162
Update Trail Option.............................................................. 162
Update Trail Criteria (Auto, Time, Distance) ................. 162
Trail Update Rate (Time, Distance)................................. 162
Specific Trail Options........................................................ 163
Delete Trail ........................................................................... 163
New Trail............................................................................... 163
Trail Visible/Invisible and Other Trail Options .................. 163
Units of Measure....................................................................... 164
Section 9: Searching ............................................................165
Find Addresses.......................................................................... 165
Find Any Item Selected by Map Cursor .................................. 168
Find Interstate Highway Exits ................................................ 168
Find Map Places or Points of Interest (POI) ........................... 171
Find Streets or Intersections.................................................... 172
Find a Street ......................................................................... 172
Find an Intersection ............................................................. 174
Find Waypoints......................................................................... 176
Section 10: Supplemental Material ................................... 179
Notes.............................................. Error! Bookmark not defined.
vi
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.
2
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.)
3
Capabilities and Specifications: LCX-20C
General
Display:............................ High-brightness LCD; programmable to
viewing preference.
LCX-20C: 6.0" (15.2 cm) diagonal.
Resolution:...................... LCX-20C: 320 pixel x 240 pixel resolution;
76,800 total pixels; 256-color, full VGA.
Backlighting:.................. Fluorescent cold cathode backlit screen with
multiple lighting levels; backlit keypad.
Input power:................... 10 to 15 volts DC.
Current drain: ............... Sonar only: 500 ma lights off; 600 ma lights
on. With GPS and lights on: 700 ma.
Case size:......................... 7.3" H x 9.6" W x 3.7" D (18.5 x 24.4 x 9.4
cm); sealed and waterproof; suitable for
saltwater use.
MMC slots: ...................... Two in waterproof compartment (SD card
compatible).
Back-up memory: .......... Built-in memory stores sonar records and
GPS data for decades. User settings are
stored when unit is turned off.
Languages:...................... 10 languages selectable by user.
Sonar
Frequency:...................... Depending on transducer, either 50/200 kHz
dual-frequency or 200 kHz single-frequency.
Transducers: .................... Skimmer transducer with built-in
temperature sensor available. Use either a
dual-frequency transducer with 35° °/12 cone
angles or a single-frequency transducer with a
20° cone angle. Both transducers operate at
speeds up to 70 mph (61 kts).
Transmitter: ................... Dual-frequency: 8,000 watts peak-to-
peak/1 kW RMS.
Single-frequency: 3,000 watts peak-to-
peak/375 watts RMS.
Sonar sounding
Depth capability:........... Dual-frequency: 3,000 feet (915 meters).
Single-frequency: 1,000 feet (305 meters)
Depth display:............... Continuous display.
4
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.
5
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
log in the unit using the Sonar Simulator function, or play it back on a
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.
6
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,
8
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.
9
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.
10
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."
11
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.
12
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.
13
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
Good location
Poor angle
Poor location
Good
location
Deadrise less than 10
°
°
°
°°
Pad Strakes
14
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
16
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
17
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
18
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
19
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
Transom
20
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
of
hull
21
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
23
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
Fill with resin
24
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
26
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
28
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
Bottom of hull
29
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.
30
LGC-2000 direct connection to GPS unit.
NOTE:
The extension cable’s shorter branch will have a 60-ohm terminator
attached to it. Do not remove this terminator. When you're not
connecting to a NMEA 2000 buss, you must leave the terminator
connected to this socket for your antenna/receiver to function correctly.
Connecting to a NMEA 2000 Network
The LGC-2000 can be connected to a NMEA 2000 buss, providing GPS
information to any Lowrance GPS 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.
There are two ways to connect the antenna to a NMEA 2000 network
port. One method (shown in the following image) is to use the extension
cable's Y-adapter to connect both the antenna and the unit to the same
network port. To do this, simply remove the 60-ohm terminator shown in
the previous image and attach the NMEA 2000 buss adapter cable to the
shorter branch of the extension cable's Y-adapter. Connect the NMEA
2000 buss adapter cable's other end to an available network port.
LGC-2000 and GPS unit connection to NMEA 2000 buss.
You can also attach the antenna to a remote port on the network, and
pass position information along the network. To do this, simply attach the
LGC-2000's connector to one end of the buss adapter cable and attach the
other to an available port on the NMEA 2000 buss, as shown in the
following image. (You will have to use a similar adapter cable to connect
the GPS unit to the NMEA buss as described later in this section.)
25' Y-adapter
extension cable
60-ohm
terminator
LGC-2000
To unit
Splitter plug
LGC-2000
To NMEA 2000
network port
25' Y-adapter
extension cable
To unit
31
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
32
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
33
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)
34
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
35
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
37
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.
38
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
39
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]
94
[3.61]
56.9
[2.24]
185
[7.34]
37.1
[1.37]
40
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
41
MMC, twist the drawer retainer counter-clockwise and pull. The
drawer will come out of the unit. Place the MMC in the drawer face
down (see following figures.)
Memory card drawer on the LCX-20C.
Slide the drawer back into the unit and twist the retainer clockwise.
The MMC is now ready for use.
Other Accessories
MMC and MapCreate
Other available accessories include MMC cards, MMC card readers and
MapCreate™ 6 custom mapping software for your computer. MMC card
readers are available in USB versions.
MapCreate™ 6 CD-ROM, left; MMC card reader for USB ports, right.
Switch Boxes
Two switch boxes are available for this unit. The SB-7X transducer
switch box switches two transducers to one sonar unit. The SB-8X
transducer switch box switches two sonar units to one transducer.
If these accessories are not available from your dealer, see the
accessory ordering information on the inside back cover of this manual.
Insert cards face down
Drawer
retainer
42
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.)
43
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.
5
4
2
8
7
9
6
3
1
MMC drawer
44
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.
46
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.
47
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
48
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.
49
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 .
50
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
52
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
53
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.
55
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.
56
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.
58
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:
1. Press MENU| | | | | .MENU ↓
↓
↓
↓↓ 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.
59
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
S AONAR LARMS|ENT|ENT|EXIT|EXIT|EXIT.
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:
1. Press MENU| | | | | .MENU ↓
↓
↓
↓↓ 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:
1. Press MENU| | | | | .MENU ↓
↓
↓
↓↓ 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.
61
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).
62
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.
63
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
Colorline
Fig. 2A
Fig. 3A
Fig. 2B
Fig. 3B
Fig. 1A Fig. 1B
64
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
66
Sonar Page Menu with Upper and Lower Limits command selected
(left); Sonar Chart Limits menu, with Upper Limit selected (right).
To change the upper and lower limits:
1. From the Sonar Page, press MENU|↓
↓
↓
↓↓ to U A L LPPER ND OWER IMITS|ENT.
The Sonar Chart Limits menu appears, with Upper Limit selected.
2. To set the upper limit, press ENT. 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 EXIT.
3. To set the lower limit, press ↓
↓
↓
↓↓ to L LOWER IMIT|ENT. 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 EXIT|EXIT|EXIT.
Normal display, in auto depth range mode, (left); Display "zoomed" with
Upper and Lower Limits focusing on the portion of the water column
from 25 feet to 45 feet deep (right). In the "zoomed" image on the right,
note the target definition, showing two fish holding just off the structure.
To turn off upper and lower limits:
From the Sonar Page, press MENU|↓
↓
↓
↓↓ to A D RUTO EPTH ANGE|ENT|EXIT.
FasTrack
This feature automatically converts all echoes to short horizontal lines
on the display's far right side. The graph on the rest of the screen
continues to operate normally. FasTrack gives you a rapid update of
Fish arches
Area "zoomed"
68
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
70
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.
74
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.
Produktspecifikationer
| Varumärke: | Lowrance |
| Kategori: | Inte kategoriserad |
| Modell: | LCX-20C |
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