Instrukcja obsługi Lowrance LMS339C
Lowrance
Radar statku
LMS339C
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Pub. 988-0152-111
www.lowrance.com
LMS-334c iGPS &
LMS-339cDF iGPS
Fish-finding Sonar & Mapping GPS
Installation and Operation
Instructions
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Copyright © 2006 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 2001-2005 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:
LMS-339cDF iGPS 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.
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Table of Contents
Section 1: Read Me First! ......................................................... 1
Capabilities and Specifications: .................................................... 3
How to use this manual: typographical conventions ................ 10
Arrow Keys.............................................................................. 12
Keyboard ................................................................................. 12
Menu Commands .................................................................... 12
Instructions = Menu Sequences ............................................. 12
Section 2: Installation & Accessories.................................. 13
Preparations................................................................................ 13
Transducer Installation.............................................................. 13
Recommended Tools and Supplies ......................................... 14
Single-frequency transom installations ............................. 14
Dual-frequency transom installations ............................... 14
Single-frequency trolling motor installations.................... 14
Shoot-through hull installations ........................................ 14
Selecting a Transducer Location............................................ 14
How low should you go?.......................................................... 16
Shoot-Thru-Hull vs. Transom Mounting ............................... 16
Transom Transducer Assembly and Mounting ..................... 17
Trolling Motor Bracket Installation (single-frequency only) 22
Transducer Orientation and Fish Arches .............................. 23
Shoot-Thru-Hull Preparation................................................. 24
Testing Determines Best Location......................................... 24
Shoot-Thru-Hull Installation ................................................. 26
Speed/Temperature Sensors................................................. 28
Optional Speed Sensor Installation ....................................... 28
Power Connections...................................................................... 29
Powering a NMEA 2000® Buss .................................................. 30
GPS Internal Antenna................................................................ 32
NMEA 2000 Cable Connections ................................................. 32
Connecting to a NMEA 2000 Network................................... 33
NMEA 0183 Wiring ................................................................ 33
Mounting the Unit: Bracket or Portable.................................... 35
MMC or SD Card Memory Card Installation............................ 38
Other Accessories........................................................................ 39
Face Cover................................................................................... 40
Section 3: Basic Sonar Operation ........................................ 41
Keyboard ..................................................................................... 41
Power/lights on and off ............................................................... 42
Main Menu .................................................................................. 42
Pages ........................................................................................... 43
Satellite Status Page .............................................................. 44
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Navigation Page ...................................................................... 45
Map Page ................................................................................. 45
SonarPage ............................................................................... 46
Basic Sonar Quick Reference ...............................................49
Sonar Operations ........................................................................ 50
Fish Symbols vs. Full Sonar Chart ........................................ 52
Other Free Training Aids ....................................................... 53
Section 4: Sonar Options & Features.................................. 55
ASP (Advanced Signal Processing)......................................... 55
Alarms ......................................................................................... 56
Depth Alarms .......................................................................... 56
Zone Alarm .............................................................................. 57
Fish Alarm............................................................................... 58
NMEA 2000 Alarm ..................................................................... 58
Calibrate Speed........................................................................... 59
Chart Speed................................................................................. 59
ColorLine
.................................................................................. 60
Depth Cursor............................................................................... 61
Depth Range - Automatic ........................................................... 62
Depth Range - Manual................................................................ 63
Depth Range - Upper and Lower Limits ................................... 63
FasTrack .................................................................................. 65
Fish I.D. ................................................................................... 65
FishTrack ................................................................................. 66
Frequency (LMS-339cDF only) .................................................. 68
HyperScroll.............................................................................. 69
Log Sonar Chart Data ................................................................ 69
NMEA 2000 ................................................................................. 70
Noise Rejection............................................................................ 70
Overlay Data............................................................................... 70
Ping Speed & HyperScroll....................................................... 74
Reset Options .............................................................................. 76
Reset Water Distance ................................................................. 76
Set Keel Offset ............................................................................ 76
Sensitivity & Auto 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 (LMS-339cDF only) ................ 81
Digital Data/Chart.................................................................. 82
Customize Page Displays........................................................ 82
Flasher..................................................................................... 83
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Map With Sonar Split Screen................................................. 84
Sonar Simulator.......................................................................... 84
Stop Chart ................................................................................... 86
Surface Clarity............................................................................ 87
Transparency .............................................................................. 88
Upper and Lower Limits ............................................................ 89
Zoom & Zoom Bar ....................................................................... 89
Zoom Pan..................................................................................... 89
Section 5: Sonar Troubleshooting .......................................91
Section 6:Basic GPS Operations .......................................... 95
Keyboard ..................................................................................... 95
Power/lights on and off ............................................................... 96
Main Menu .................................................................................. 96
Pages ........................................................................................... 97
Sonar Page .............................................................................. 98
Satellite Status Page .............................................................. 98
Navigation Page .................................................................... 100
Map Page ............................................................................... 103
Background map vs. MapCreate map content .................... 104
Basic GPS Quick Reference ................................................108
Find Your Current Position...................................................... 109
Moving Around the Map: Zoom & Cursor Arrow Keys........... 109
Selecting Map Item With the Cursor....................................... 110
Searching................................................................................... 110
Set a Waypoint.......................................................................... 112
Navigate To a Waypoint ........................................................... 114
Set Man Overboard (MOB) Waypoint...................................... 115
Navigate Back to MOB Waypoint............................................ 115
Navigate to Cursor Position on Map........................................ 116
Navigate to a Point of Interest................................................. 117
Creating and Saving a Trail..................................................... 117
Displaying a Saved Trail .......................................................... 119
Navigating Trails...................................................................... 120
Visual Trailing ...................................................................... 120
Navigate a Trail .................................................................... 120
Navigate a Back Trail........................................................... 122
Transfer Custom Maps and GPS Data Files ....................... 123
Cancel Navigation..................................................................... 125
Section 7: Advanced GPS Operations............................... 127
Find Distance from Current Position ...................................... 127
Find Distance From Point to Point .......................................... 127
Icons........................................................................................... 127
Create Icon on Map............................................................... 128
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Create Icon at Current Position ........................................... 128
Delete an Icon ....................................................................... 128
Navigate to an Icon............................................................... 129
Routes........................................................................................ 129
Create and Save a Route ...................................................... 130
Delete a Route....................................................................... 132
Edit a Route Name................................................................ 132
Edit Route Waypoints........................................................... 133
Navigate a Route................................................................... 133
Navigate a Route in Reverse ................................................ 134
Trails ......................................................................................... 135
Delete a Trail ........................................................................ 135
Edit a Trail Name ................................................................. 135
Edit a Trail Color .................................................................. 136
Edit a Trail Pattern .............................................................. 136
Utilities...................................................................................... 137
Alarm Clock........................................................................... 137
Sun/Moon Rise & Set Calculator.......................................... 137
Trip Calculator...................................................................... 137
Trip Down Timer................................................................... 137
Trip Up Timer ....................................................................... 137
Waypoints.................................................................................. 137
Delete a Waypoint................................................................. 137
Edit a Waypoint .................................................................... 138
Selecting a Waypoint ............................................................ 138
Set a Waypoint by Average Position.................................... 139
Set a Waypoint by Projecting a Position.............................. 139
Section 8: System & GPS Options ...................................... 141
Alarms ....................................................................................... 141
NMEA 2000 Alarm ................................................................... 142
Auto Satellite Search................................................................ 143
Check MMC Files and Storage Space...................................... 144
Communications Port Configuration ....................................... 144
Configure NMEA ...................................................................... 145
Coordinate System Selection.................................................... 145
Map Fix ..................................................................................... 147
Customize Page Displays ......................................................... 148
GPS Simulator .......................................................................... 149
Hide GPS Features ................................................................... 151
Initialize GPS............................................................................ 151
Map Auto Zoom......................................................................... 151
Map Data................................................................................... 151
Show Map Data..................................................................... 152
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Pop-up Map Information ...................................................... 152
Map Boundaries .................................................................... 152
Fill Water With White .......................................................... 152
Map Overlays (Range Rings; Lat/Long Grid) ...................... 152
Map Datum Selection ............................................................... 153
Map Detail Category Selection................................................. 154
Map Orientation ....................................................................... 154
NauticPath USA Marine Charts........................................... 156
Nautical Chart Notes............................................................ 156
Port Information ................................................................... 157
Tidal Current Information ................................................... 158
Tide Information ................................................................... 160
Navionics Charts..................................................................... 161
NMEA 2000............................................................................... 162
Overlay Data............................................................................. 162
Pop-up Help............................................................................... 166
Reset Options............................................................................ 166
Screen Contrast and Brightness .............................................. 167
Set Language ............................................................................ 167
Set Local Time .......................................................................... 168
Show WAAS Alarm................................................................... 168
Software Version Information.................................................. 169
Sounds and Alarm Sound Styles.............................................. 169
Track Smoothing....................................................................... 170
Trail Options............................................................................. 170
General Trail Options....................................................... 170
Specific Trail Options........................................................ 171
Delete Trail ........................................................................... 171
New Trail............................................................................... 171
Trail Visible/Invisible and Other Trail Options .................. 172
Transparency ............................................................................ 172
Units of Measure....................................................................... 173
Section 9: Searching .............................................................175
Find Streets............................................................................... 175
Find Any Item Selected by Map Cursor .................................. 176
Find Interstate Highway Exits ................................................ 177
Find Map Places or Points of Interest ..................................... 178
Find Streets or Intersections.................................................... 180
Find Waypoints......................................................................... 183
Section 10: Supplemental Material ...................................185
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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 way-
point, 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 re-
sponsible for operating the vehicle in a safe manner. Vehicle operators
must maintain full surveillance of all pertinent driving, boating or fly-
ing 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.
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Section 1: Read Me First!
How this manual can get you out on the road, fast!
Welcome to the exciting world of digital sonar and GPS! We know
you're anxious to begin navigating and finding fish, but we have a favor
to ask. Before you grab the unit and begin installing it, please give us a
moment or two to explain how our manual can help you get the best
performance from your compact, wide-screen, combination fish finder
and mapping GPS receiver.
First, we want to thank you for buying a Lowrance sonar/GPS unit.
Whether you're a first time user or a professional fisherman, you'll dis-
cover that your unit is easy to use, yet capable of handling demanding
navigation and sonar tasks. When you team your unit with our custom
mapping software MapCreate 6, you have an incredible combination.
You won't find another combination GPS and sonar unit with this much
power and this many features for this price!
Our goal for this book is to get you on the water fast, with a minimum
of fuss. Like you, we'd rather spend more time boating or fishing and
less time reading the manual!
So, we designed our book so that you don't have to read the whole thing
from front to back for the information you want. At the start (or end) of
each segment, we'll tell you what content is coming up next. If it's a
concept you're already familiar with, we'll show you how and where to
skip ahead for the next important topic. We've also made it easy to look
up any tips you may need from time to time.
The manual is organized into 10 sections. This first section is an intro-
duction to the LMS-334 iGPS and LMS-339cDF iGPS sonar and GPS. It
tells you the basics you need to know before you can make the unit look
around and tell you where you are, or look below the surface to find
some fish.
Section 2 will help you install your unit and the transducer. We'll show
you how to get the MultiMedia Card (MMC) correctly installed inside
the unit. We'll also tell you about some of the available accessories.
Section 3 covers Basic Sonar Operation. It will show you how easy it is
to run your sonar, right out of the box. This section features a one-page
Sonar Quick Reference. (If you've already jumped ahead and fig-
ured out how to install the unit yourself, and you just can't wait
any longer, turn to the Quick Reference on page 49 and head
for the water!)
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After you've gained some experience with your sonar, you'll want to
check out Section 4, which discusses more advanced Sonar Options and
Other Features.
When you come to a sonar menu command on your unit’s screen, you can
look it up in the manual by skimming over the table of contents, just flip-
ping 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 in-
troduces you to Basic GPS Operations. This section features a one-
page GPS Quick Reference on page 108.
Section 6 contains short, easy-to-scan GPS lessons that follow one an-
other 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 expe-
rience), you may want to try out some of the unit’s many advanced
navigation features. That brings us to Section 7, Advanced GPS Opera-
tions. This section contains the rest of your unit’s GPS command func-
tions, organized in alphabetical order.
When you come to a GPS menu command on the screen, look it up in
the manual by skimming the table of contents, flipping through Section
6 or scanning through the command portion of Section 7.
Your unit is ready to use right out of the box, but you can fine tune and
customize it's 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 opera-
tions. 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 Ba-
sic GPS Operation section, but there are so many map items you can
search for, we had to give this function it's own section in the manual! For
example, did you know your unit can look up business phone numbers,
functioning as 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 used, warranties and customer service information.
Now, if you're into the fine details, glance over the next segment on
specifications to see just how much sonar and GPS power your unit con-
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tains. It's important to us (and our power users), but, if don't careyou
how many watts of power the unit has, or how many waypoints the your
unit can store, skip ahead to important information on how the sonar
works, on page 5. (Background on GPS begins on page 6.)
Capabilities and Specifications: LMS-334c iGPS and LMS-
339cDF iGPS
General
Display:............................ 5.0" (12.7 cm) diagonal; 256-color Solar-
MAX™ TFT display; programmable to
viewing preference.
Resolution:...................... 480 pixel x 480 pixel resolution; 230,400 total
pixels.
Backlighting:.................. Backlit fluorescent/ cold cathode screen and
keypad with multiple lighting levels for night
use.
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:......................... 5.4" H x 6.9" W x 3.4" D (13.8 x 17.6 x 8.6
cm); sealed and waterproof; suitable for
saltwater use.
MMC slots: ...................... One with waterproof door (SD card compati-
ble).
Recording:........................GPS uses MMC & SD cards for recording trip
details and displaying charts or custom maps.
Sonar uses them to record and save sonar
chart logs.
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; menu languages selectable by user.
Sonar
Frequency:...................... LMS-339cDF: 50/200 kHz.
LMS-334c: 200 kHz.
Transducers: .................... A dual-frequency Skimmer
transducer with
built-in temperature sensor is packed with the
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LMS-339cDF. A single-frequency Skimmer
transducer with built-in temperature sensor is
packed with the LMS-334c. Transducers offer
up to 60 of fish detection coverage and oper-°
ate at speeds up to 70 mph (61 kts).
Transmitter: ................... LMS-339cDF: 4,000 watts peak-to-peak/500
watts RMS. : 2,400 watts peak-to-LMS-334c
peak/300 watts RMS.
Sonar sounding
Depth capability:........... 2,500 feet/762 meters.LMS-339cDF:
LMS-334c: 900 feet/274 meters.
(Actual capability depends on transducer
configuration and installation, bottom com-
position and water conditions. All sonar
units typically read deeper in fresh water
than in salt water.)
Depth display:................ Continuous display.
Graph recording:........... Up to 2 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 (sensor in-
cluded with LMS-339cDF.)
GPS
Receiver/antenna:............Internal; 12 parallel channel NMEA 2000-
ready GPS/WAAS antenna.
Background map:.......... Built-in custom, detailed Lowrance map.
Contains: enhanced detail of continental U.S.
and Hawaii. Includes more than 60,000 nav
aids and 10,000 wrecks/obstructions in
coastal and Great Lakes waters. Metro ar-
eas, selected major streets/highways and in-
terstate exit services details included.
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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 FreedomMaps , Fishing Hot
Spots Elite, LEI NauticPath charts,
LakeMaster ProMaps and Navionics
charts.
Mapping memory:............Up to 2 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.
Graphic symbols for
waypoints or event
marker icons: ................. 42.
Routes:............................. 100; up to 100 waypoints per route.
Plot Trails: ...................... 10 savable; up to 9,999 points per trail.
Zoom range:.................... 40 ranges; 0.02 to 4,000 miles.
NOTE:
The above memory capacities refer only the unit’s on-board memory.
The amount of GPS or sonar data you can record and save for recall
later is only limited by the number of MMC cards you have.
NOTICE!
The storage temperature range for your unit is from -4 degrees to +167
degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended stor-
age in temperatures higher or lower than specified will damage the liq-
uid 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 Lowrance 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 under water basics.
Sonar is an abbreviation for SOund NA vigation and Ranging, a tech-
nology developed during World War II for tracking enemy submarines.
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(Lowrance developed the world's first transistorized sonarsportfishing
in 1957.) A sonar consists of a transmitter, transducer, receiver and
display. In simple terms, here's how it finds the bottom, or the fish:
The transmitter emits an electrical impulse, which the transducer con-
verts 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 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 per-
sonal 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 is only
limited by the free space available on your MMC.
How Lowrance GPS Works
You'll navigate faster and easier if you understand how your unit scans
the sky to tell you where you are on the earth — and, where you're go-
ing. (But if you already have a working understanding of GPS receivers
and the GPS navigation system, skip ahead to Section 2, Installation &
Accessories on page 13. 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 unit easy to use, so you don't need to be a com-
puter expert to find your way!) It 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 desti-
nation.
This gimbal-mounted unit uses an internal antenna and receiver,
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. Your unit listens to signals from
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as many satellites as it can "see" above the horizon, eliminates the
weakest signals, then computes its location in relation to those satel-
lites. Once the unit figures its latitude and longitude, it plots that posi-
tion 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 each 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 their contents and differ-
ences in Section 6, , on page 95.Basic GPS Operations
Another portion of the unit’s onboard memory is devoted to recording
GPS navigation information, which includes waypoints, event marker
icons, trails and routes. This lets you look back the way you came.
Think of this data storage like the hard drive memory in a computer or
a tape in a cassette tape recorder. You can save several different GPS
data files, erase 'em and record new ones, over and over again. These
GPS Data Files (file format *.usr) can be shared between, not only the
LMS-334c iGPS and LMS-339cDF iGPS, but other Lowrance GPS units
and even personal computers.
Your unit has one more thing in common with a personal computer.
Just as computers have a floppy disk drive for storing and exchanging
files, the unit has a slot for an MMC (MultiMedia Card) or SD card (Se-
cure Digital card) flash memory card. These solid-state memory devices
are about the size of a postage stamp, but can hold data ranging from 8
MB to 2 GB. (Compare that to a floppy disk's 1.44 MB capacity!) Your
unit uses all that MMC space for two key GPS purposes. (The MMC is
also used to record sonar logs.)
First, you can backup your onboard GPS Data Files by copying them to
the MMC. Since the MMC is MMCs, if you don't have a computer.) Our
MapCreate mapping software can save, edit or create its own GPS Data
Files, which can be copied to the MMC and then loaded from the MMC
into unit’s memory. (NOTE: No matter where they come from, GPS Data
Files must be loaded from the MMC into memory before your unit can
use them.)
The other key GPS use for MMCs is storage of special high-detail, cus-
tom maps, which you can produce on your computer with our MapCre-
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ate software. These MapCreate custom maps contain much greater de-
tail than the basic background map. These Custom Map Files (file
format *.lcm) not only may be shared between the LMS-334c iGPS and
339cDF iGPS, but also with other Lowrance GPS and sonar/GPS units
as well as personal computers. (For example, the exact same MMC,
custom map files and GPS data files can be used interchangeably be-
tween your gimbal-mounted unit and the hand-held iFINDER GPS
receiver.)
Your unit automatically reads Custom removable (like a floppy disk or a
cassette tape), you can store these GPS Data Files on a personal com-
puter equipped with an MMC card reader. (Or store them on a pocketful
of Map Files directly from the MMC or SD card. To use a custom map,
all you need to do is slide an MMC containing a map into the unit.
Introduction to GPS and WAAS
Well, now you know the basics of how your unit does its work. You
might be ready to jump ahead to Section 2, Installation & Accessories,
on page 13, so you can mount your unit and plug in the power. Or you
might want to see how our text formatting makes the manual tutorials
easy to skim. If that's the case, move on to "How to Use This Manual"
on page 11. But, if you want to understand the current state of satellite
navigation, look over this segment describing how GPS and its new
companion WAAS work together to get you where you're going.
The Global Positioning System (GPS) was launched July 17, 1995 by
the United States Department of Defense. It was designed as a 24-
hour-a-day, 365-days-a-year, all weather global navigation system for
the armed forces of the U.S. and its allies. Civilian use was also avail-
able at first, 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 govern-
ment 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 loca-
tions in the sky. Each satellite broadcasts a low-power signal that iden-
tifies the satellite and its position above the earth.
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9
Three of these satellites are spares, unused until needed. The rest vir-
tually guarantee that at least four satellites are in view nearly any-
where on Earth at all times. 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.
A minimum of three satellites are required to determine a 2D fix.
Remember, the unit must have a clear view of the satellites in order to
receive their signals. Unlike radio or television signals, GPS works at
very high frequencies. These signals can be easily blocked by trees,
buildings, an automobile roof, even your body.
Like most GPS receivers, the unit doesn’t have a compass or any other
navigation aid built inside. It relies solely on the signals from the sat-
ellites to calculate a position. Speed, direction of travel, and distance
are all calculated from position information. Therefore, in order it 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 be more "wandering" of the data shown on
the display.
GPS alone is accurate for route navigation, but the U.S. Federal Avia-
tion Administration has special aircraft navigation needs that go be-
yond basic GPS. So, the FAA has developed a program to boost GPS
performance with its Wide Area Augmentation System, or WAAS. The
FAA commissioned the system on July 11, 2003.
WAAS is designed to increase GPS accuracy to within 7.6 meters verti-
cally and horizontally, but it consistently delivers accuracies within 1-2
meters horizontal and 2-3 meters vertical, according to the FAA. It does
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10
this by broadcasting correction signals on GPS frequencies. Your unit
automatically receives both GPS and WAAS signals.
However, there are some fringe areas of the U.S., including parts of
Alaska, that do not yet receive robust WAAS coverage. Continued
WAAS development is planned to extend WAAS coverage in the years
to come.
WAAS boosts 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 consis-
tently good WAAS reception, but terrain, foliage or even large man-
made structures can sometimes 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. Remember, however, that this
receiver is only a tool. Always have another method of navigation avail-
able, such as a map or chart and a compass.
Also remember that 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, for example. It’s up to you to safely navigate
around obstacles, no matter how you’re using this product.
Free Training Aids Available
Now that you know something about the technology that makes this
unit possible, you are ready to start learning how to use that technol-
ogy. This manual will guide you through the process of setting up and
running your unit, but that is only one of many resources available.
If you or a friend has Internet access, visit our web site. Find us at
WWW.LOWRANCE.COM. The site is packed with additional information
on using our products.
For instance, you can learn more about interpreting what you see on
your sonar screen with our free Sonar Tutorial. The tutorial includes
animated illustrations and more pictures of actual sonar returns, all
described in detail. There's even a printer friendly version of the tuto-
rial available on our web. It makes a great supplement to this manual.
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11
Sonar Viewer
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, ColorLine, noise rejection,
surface clarity, etc.
• Color interpretation of sonar signals can be user defined.
• Operates like a Windows Multimedia Player with forward, re-
verse, 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.
Emulator
For the ultimate training aid, be sure to download the free emulator
software for your unit. This program can help you learn both basic and
advanced operations without burning boat fuel!
This PC application simulates the actual sonar/GPS unit on your com-
puter. 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.
The emulator works exactly like your real sonar/GPS unit. When using
the Sonar and GPS Simulators you can play back sonar logs, run GPS
routes and trails, even create real waypoints you can use in the field.
You can take snapshots of the Sonar Chart and print them or e-mail
them to friends.
And that is just some of the material available on our web site. To find
out what we have available, log on and look around. For now, we'll get
back to how to use this particular unit.
How to use this manual: typographical conventions
Many instructions are listed as numbered steps. The keypad and arrow
"keystrokes" appear as boldface type. So, if you're in a real hurry (or
just need a reminder), you can skim the instructions and pick out what
menu command to use by finding the boldface command text. The fol-
lowing paragraphs explain how to interpret the text formatting for
those commands and other instructions:
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12
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 hori-
zontal line depth cursor on the sonar screen. The arrow keys help you
move around the menus so you can execute different commands. They
are represented by symbols like these, which denote the down arrow
key, the up arrow, the left arrow and the 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, sans serif type. 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 your 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 ENT| |
→
→
→
→→ ↓
↓
↓
↓↓ to NAVIGATE| .
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..
Translated into complete English, step 1 above would mean: "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 would mean: "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."
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13
Section 2: Installation
Preparations
You can install the unit in some other order if you prefer, but we rec-
ommend this installation sequence:
Caution:
You should read over this entire installation section before drill-
ing any holes in your vessel!
1. Determine the approximate location for the unit, so you can plan how
and where to route the cables for the transducer, any sensor and power.
This will help you make sure you have enough cable length for the de-
sired configuration.
NOTE:
The GPS antenna is inside the unit, so you must mount the unit in
a location with an unobstructed view of the sky.
2. Determine the approximate location for the transducer, any sensor
and their cable routes.
3. Determine the location of your battery or other power connection,
along with the power cable route.
4. Install the transducer and route the transducer cable to the sonar
unit. Install the speed or temp sensor, if applicable, and route the cable
to the unit.
5. Route the power cable from the unit's location to an appropriate
power source and connect it there.
6. Connect the transducer/power cable (and any sensor cables) to the
unit and mount the unit on the bracket.
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 optional troll-
ing 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 trans-
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14
ducer does "kick-up," the bracket can easily be pushed back into place
without tools.
Read these instructions carefully before attempting the installation.
Determine which of the installation methods 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, transducer location 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" (25.4 mm) drill bit. A transom mount requires use of a
high quality, marine grade above- or below-waterline sealant/adhesive
compound.
NOTE:
The following installation types also call for these recommended
tools and required supplies (supplies are included):not
Single-frequency transom installations
Tools include: two adjustable wrenches, drill, #29 (0.136") drill bit, flat-
head screwdriver. Supplies: above- or below-high quality, marine grade
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 seal-
ant/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
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15
water, interference caused by bubbles and turbulence will show on the
sonar's display in the form of random lines or dots whenever the boat is
moving.
NOTE:
Some aluminum boats with strakes or ribs on the outside of the
hull create large amounts of turbulence at high speed. These boats
typically have large outboard motors capable of propelling the boat
at speeds faster than 35 mph. Typically, a good transom location on
aluminum boats is between the ribs closest to the engine.
3. The transducer should be installed with its face pointing straight
down, if possible. For shoot-thru applications: Many popular fishing
boat hulls have a flat keel pad that offers a good mounting surface. On
vee hulls, try to place the transducer where the deadrise is 10° or less.
Vee pad hull (left); Vee hull (right). 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 trans-
ducer cable around these wires.
Good and poor transducer locations.
CAUTION: Clamp the trans-
ducer 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
loc
a
tion
Deadrise less than 10
°
°
°
°°
Pad Strakes
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16
Align transducer centerline with hull bottom. A dual frequency
transducer (left) and a single frequency transducer (right).
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 protec-
tion from bangs and bumps.
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 fre-
quently lose bottom signal lock while running at high speed, the trans-
ducer 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 want, 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 passes through the hull
and into the water. This differs from a bolt-thru-hull installation (often
called "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 contact with the water.
Typically, shoot-thru-hull installations give excellent high speed opera-
tion 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
Transom
Tra
n
som
Hull bottom
Hull bottom
Transducer
centerline
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17
knocked off when docking or loading on a trailer.
The shoot-thru-hull installation does have its drawbacks. First, some
loss of sensitivity does occur, even on the best hulls. This varies from
hull to hull, even from different installations on the same hull. This is
caused by differences in hull lay-up and construction.
Second, the transducer angle cannot be adjusted for the best fish arches
on your sonar display. (This is not an issue for flasher-style sonars.)
Lack of angle adjustment can be particularly troublesome on hulls that
sit with the bow high when at rest or at slow trolling speeds.
Third, a transducer CAN NOT shoot through wood and metal hulls.
Those hulls require either a transom mount or a thru-hull installation.
Fourth, if your Skimmer transducer has a built in temp sensor, it will
only show the temperature of the bilge, not the water surface temp.
Follow the testing procedures listed in the shoot-thru-hull installation
section of this instruction booklet to determine if you can satisfactorily
shoot through the hull.
Transom Transducer Assembly and Mounting
The best way to install these transducers is to loosely assemble all of
the parts first, place the transducer's bracket against the transom and
see if you can move the transducer so that it's parallel with the ground.
The following instructions sometimes vary depending on the mounting
bracket that came with your transducer. Single frequency Skimmers
come with a one-piece stainless steel bracket, while dual frequency
Skimmers come with a two-piece plastic mounting bracket. Use the set
of instructions that fits your model.
1. Assembling the bracket.
A. One-piece bracket: Press the two small plastic ratchets into the
sides of the metal bracket as shown in the following illustration. Notice
there are letters molded into each ratchet. Place each ratchet into the
bracket with the letter "A" aligned with the dot stamped into the metal
bracket. This position sets the transducer's coarse angle adjustment for a
14° transom. Most outboard and stern-drive transoms have a 14 angle.°
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18
Align plastic ratchets in bracket.
B. Two-piece bracket: Locate the four plastic ratchets in the trans-
ducer'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 tran-
soms have a 14° angle.
Insert and align ratchets.
Add ratchets to bracket and transducer.
Dot
Alignment letters
Alignment
positions
Transducer bracket
Transducer
Transducer
bracket
Ratchet Ratchet
Transducer
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19
2. Aligning the transducer on the transom.
A. One-piece bracket: Slide the transducer between the two ratch-
ets. 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.
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.
Assemble transducer and bracket.
Ratchets
Flat washer
Lock washer
Flat washer
Nut
Bolt
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20
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 posi-
tion 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.
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 fig-
ure. Don't tighten the lock nut at this time.
Assemble transducer and bracket.
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 trans-
ducer'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).
Nut
Metal
washer
Metal washer
Bolt
Rubber
washers
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21
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).
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 sealant 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.
Transom
Transom
Flat-bottom hull
Deep-"vee" hull
Bottom
of
hull
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22
6. Route the transducer cable through or over the transom to the so-
nar 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 enter-
ing 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 will be 5/8".
Caution:
If you drill a hole in the transom for the cable, make sure it is lo-
cated above the waterline. After installation, be sure to seal the
hole with the same marine grade above- or below-waterline seal-
ant used for the mounting screws.
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, hope-
fully below the turbulence causing the noise. Don't allow the transducer
bracket to go 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. Po-
sition the transducer to aim straight down when the motor is in the
water. Tighten the strap securely.
TMB-S bracket
Bolt Internal tooth washer
Nut
Flat washer
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23
3. Route the transducer cable alongside the trolling motor shaft. Use
plastic ties (not included) to attach the transducer cable to the troll-
ing 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 trans-
ducer is ready for use.
Transducer mounted on trolling motor, side view.
Transducer Orientation and Fish Arches
If you do not get good fish arches on your display, it could be because
the transducer is not parallel with the ground when the boat is at rest
in the water or at slow trolling speeds. If the arch slopes up – but not
back down – then the front of the transducer is too high and needs to be
lowered. If only the back half of the arch is printed, then the nose of the
transducer is angled too far down and needs to be raised.
Transducer angles and their effects on fish arches.
Transducer aimed
too far back
Transducer aimed
too far forward
Proper transducer angle
Partial fish arches
Full fish arch
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24
NOTE:
Periodically wash the transducer's face with soap and water to re-
move any oil film. Oil and dirt on the face will reduce the sensitivity
or may even prevent operation.
Shoot-Thru-Hull Preparation
Hulls With Flotation Materials
The transducer installation inside a fiberglass hull must be in an area
that does not have air bubbles in the resin or separated fiberglass lay-
ers. 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. See the figure below.
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.
Epoxy the transducer to 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.
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.
Fill with resin
Inner hull
Epoxy to hull first Outer hull
Flotation material
Fill with resin
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25
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. 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
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26
3. Now move the transducer around to find the best location with the
strongest possible bottom signal. If you find a spot with an acceptable
bottom signal, mark the location and move on to step 4.
If you can't get an acceptable bottom signal, try turning up the sensi-
tivity by three or five keystrokes and then move the transducer around
once more. If you find a spot that works, mark it and move on to step 4.
If you have to turn up sensitivity by more than five keystrokes to get
a good signal, the transducer should be mounted on the outside of the
hull. This is especially true if you have to turn sensitivity all the way
up to get a decent bottom signal.
4. Most people can get good results by following steps 1 through 3, so this
step is optional. If you want to make an extra effort to be absolutely sure
that your selected location will work under all conditions, make a test
run with the boat on plane and observe the bottom signal.
You'll need to figure some way to prop the transducer into position while
you make your test run. (A brick or two might be sufficient to hold it in
place.)
5. When you're satisfied with a location, mark it and proceed with the
installation.
Shoot-Thru-Hull Installation
If you are installing the transducer on a hull with floatation material
sandwiched within the hull, refer to the text "Hulls With Flotation Ma-
terials" beginning on page 24.
1. Make sure the area is clean, dry and free of oil or grease, then sand
both the inside surface of the hull and the face of the transducer with
100 grit sandpaper. The sanded hull area should be about 1-1/2 times
the diameter of the transducer. The surface of the hull must be flat
so the entire transducer face is in contact with the hull prior to
bonding. After sanding, clean the hull and transducer with rubbing
alcohol to remove any sanding debris.
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27
Epoxy transducer to hull.
WARNING:
Use only the epoxy available from LEI. It has been for-
mulated 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 ep-
oxy 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 ep-
oxy 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
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28
Speed/Temperature Sensors
Optional Speed Sensor Installation
All the units in this series can display speed and distance traveled, but
only the LMS-339cDF iGPS comes packed with a speed sensor. If you
want to purchase an optional additional sensor for your unit, refer to
the accessory ordering information inside the back cover of this man-
ual. The following instructions describe how to install the speed sensor.
Recommended tools for this job include: drill, 7/8" drill bit, 1/8" drill bit
for pilot holes, screwdriver. Required supplies for this job include: four
#8 stainless steel wood screws (3/4" long), high quality, marine grade
above- or below-waterline sealant.
First find a location on the boat's transom where the water flow is
smoothest. Don't mount the sensor behind strakes or ribs. These will
disturb the water flow to the speed sensor. Make sure the sensor will
remain in the water when the boat is on plane. Also make sure the lo-
cation doesn't interfere with the boat's trailer. Typically, the sensor is
mounted about one foot to the side of the transom's centerline.
Once you've determined the proper location for the unit, place the sen-
sor on the transom. The bottom of the bracket should be flush with the
hull's bottom. Using the sensor as a template, mark the hull for the
screws' pilot holes. Drill four 1/8" holes, one in each end of the slots.
Mount the sensor to the hull using #8 stainless steel wood screws (not
included). Use a high quality, marine grade above- or below-waterline
sealant to seal the screws. Make sure the sensor is flush with the bot-
tom of the hull and tighten the screws.
Stern view showing good location for mounting sensor on transom.
Good location
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29
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 tran-
som and the sensor with the sealant compound. 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 lo-
cated above the waterline. After installation, be sure to seal the
hole with the same marine grade above- or below-waterline seal-
ant 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 sen-
sor's socket. If you have any questions concerning the installation of the
sensor, please contact your local boat dealer.
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.
(For more detailed information on NMEA 2000 or LowranceNET
networks, see the NMEA 2000 Networks General Information booklet
packed with your unit.) The thicker three-wire cable (red, black and
white) is the Power Supply for your unit (and optional external speaker
connection for some units).
Depending on your configuration, you may not use all of the wires. The
following segments include instructions for installing all the unit's
wires.
Transom
Bottom of hull
Bottom of hull
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30
The Power/Data cable for this unit.
Caution
All of the wires in the power/data cable have bare ends for eas-
ier 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.)
Powering a NMEA 2000 Buss
(NMEA 2000 Power cable)
A NMEA 2000 buss must be connected to a 12-volt DC power source to
operate. If you have a pre-existing NMEA 2000 installation, it may al-
ready 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 need to power a NMEA 2000 buss, attach the NMEA 2000 Power
cable to an accessory power switch. The cable's red wire should be at-
tached (with the provided 3-amp fuse) to the positive terminal and the
cable's black and shield wires should both be attached to the negative
terminal.
You can attach the NMEA 2000 power cable directly to the boat's bat-
tery, but you must use the fuse and install an on-off switch so
you can shut off power to the network. If a NMEA 2000 power ca-
ble is connected directly to a battery, the NMEA 2000 network will con-
tinuously draw power and drain the battery, even though the boat, your
unit and other NMEA 2000 devices are turned off.
Caution:
Never connect a NMEA 2000 power cable to an un-switched
power supply. Failure to use a power switch will allow the
NMEA 2000 network to drain the boat's battery when the system
is not in use! When you are not using the network, you should al-
ways shut the power off.
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
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34
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
![](https://manualstech.ams3.cdn.digitaloceanspaces.com/html/nl/lowrance/lms339c/html/bg2b.png)
35
LMS-334c iGPS and LMS-339cDF iGPS cable connections.
Mounting the Unit: Bracket or Portable
You can install the sonar unit on the top of a dash with the supplied
gimbal bracket. It can also be mounted on a portable power supply.
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.
Network
socket
Power/Data socket
Power Supply
cable
NMEA 0183
Data cable
(four wires)
Sonar socket
Transducer
NMEA 2000
Power cable
Optional speed sensor
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36
Optional R-A-M mounting system.
Bracket Installation
Mount the unit in a convenient location, provided there is clearance
behind the unit when it's tilted for the best viewing angle. This must
be a location with a clear view of the sky, so the internal GPS
antenna can lock-on to satellite signals. Make sure there is enough
room behind the unit to attach the power and transducer cables.
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 fiber-
glass panels to reinforce the panel and secure the mounting hardware.
Install the gimbal bracket. Position the bracket so the arms slope to-
ward the front of your unit.
Front
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37
Drill a 1-inch (25.4 mm) hole in the dash for the power and transducer
cables. The best location for this hole is immediately under the gimbal
bracket location. This way, the bracket can be installed so that it covers
the hole, holds the cables in position and results in a neat installation.
Some customers prefer to mount the bracket to the side of the cable
hole. It's a matter of personal preference.
Front view (left) and side view (right) showing dimensions of the unit
when mounted on gimbal bracket.
Pass the power cable's bare-wire end down though the hole from the
top. If you want, you can fill in the hole around the cables with a good
marine sealant. (Some marine dealers stock cable hole covers to conceal
the opening.) No matter what type of installation you prefer, be sure to
leave enough slack in the cables to allow tilting or swiveling the unit. If
you choose to fill in the hole, be sure to position the cables against the
rear edge of the hole as you apply the fill material.
Before positioning the bracket, be sure to hold the cables against the
rear edge of the hole. Then, slide the bracket over the hole and butt the
rear of the bracket base firmly against the cables, pinning them in
place against the side of the hole. Finally, fasten the bracket to the
dash. Attach the unit to the gimbal bracket using the supplied gimbal
knobs and washers.
Millimeter
[Inch]
23.4
[0.92]
72.9
[2.87]
137.9
[5.43]
56.9
[2.24]
157.9
[6.22]
173.9
[6.85]
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38
Portable Installation
Like many Lowrance products, this unit is capable of portable operation
by using an optional portable power pack (PPP). The power pack and
an optional portable transducer expand the uses for your sonar unit.
The PPP makes it easy to use the unit on your boat or take it to the
dock, on an ice fishing trip or use it as a second sonar in a friend's boat.
Most LEI portable power packs can be used with eight "D" cell alkaline
batteries. Some use an optional sealed, rechargeable battery. For in-
formation on the PPP for your unit, see the accessory ordering informa-
tion inside the back cover of this manual.
Install batteries in typical portable power pack.
MMC or SD Card Memory Card Installation
Your unit uses a MultiMedia Card to store information, such as sonar
logs, custom maps, waypoints, trails and other GPS data. The unit can
also use Secure Digital cards (SD card) to store data.
NOTE:
Throughout this manual, we will use the term MMC, but just re-
member your unit can use an MMC SD card to store data.or
Both of these solid-state flash memory devices are about the size of a
postage stamp. An SD card is slightly thicker than an MMC. As this
manual went to press, MMCs were available in storage capacities of 8
MB, 16 MB, 32 MB, 64 MB and 128 MB. SD cards were available in
capacities of 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, 256 MB, 512 MB, 1
GB and 2 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 elec-
tronics stores.
"D" cell battery
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39
The MMC slot is located in a compartment on the front of the case. The
compartment door is located at the lower right corner. The following
figure shows a close-up with the door opened.
Memory card compartment with a 16 MB MMC card installed.
To remove an MMC
1. Open the card compartment door by unscrewing the thumb screw.
The screw should only be finger tight. If it was over-tightened, use a
thumbnail, a coin or a screwdriver to open the door.
2. Just press a finger against the label of the MMC and drag it from the slot.
3. Close the compartment door and fasten the thumb screw finger tight.
To add an MMC or SD Card
1. Open the card compartment door.
2. Grasp the bottom of the MMC and push the top of the card into the
slot. Once the card is started, use your fingernails to slide it the rest of
the way to the left, until it is firmly seated in the slot.
3. Close the compartment door and fasten the thumb screw finger tight.
Other Accessories
Other accessories include MMC cards, MMC card readers and MapCre-
ate™ 6 custom mapping software for your computer. LEI offers several
specialty plug-&-play map cards, including lake contour maps and ma-
rine coastal charts. A variety of LowranceNET NMEA 2000 electronic
probe sensors and digital gauges are also available.
Insert card face up,
this way
Thumb
screw
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40
MapCreate™ 6 CD-ROM (left). MMC card reader for USB ports (right).
Face Cover
A white protective cover that snaps on and off the front of the unit is
available. This cover is intended for use when the vehicle is 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.
NOTE:
When you first turn on the unit, the Map Page appears. If you
would rather start learning about GPS operation, jump 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 want to read.you
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42
4. ARROW KEYS – The arrow keys are used to navigate through
menus, make menu selections, enter data and move around the map.
5. ENT/ICONS – The Enter key allows you to save data, accept values,
execute menu commands and create event marker icons.
6. EXIT – The Exit key lets you return to the previous screen, clear
data or close a menu.
7. WPT – The Waypoint key is used to access, save and search for way-
points. It also launches the Point-of-Interest (POI) search menus and is
involved in some navigation functions.
8. ZOUT – The Zoom Out key lets you zoom out the screen. On the So-
nar Page, it returns you to a full sonar chart display. On the Map Page,
it lets you see a larger geographic area on the map, but with less detail.
9. ZIN – The Zoom In key lets you zoom in the screen. On the Sonar
Page, it 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|→
→
→
→→ to
SONAR|EXIT.
To turn on the backlight, press PWR again. The unit has three backlight
levels. Repeatedly pressing PWR will cycle through the backlight set-
tings and turn off the backlight.
Turn off the unit by pressing and holding the PWR key for 3 seconds.
Main Menu
The unit has a Main Menu, which contains function and setup option
commands. The instructions in this section will deal only with sonar
functions, the basic commands that make the unit show sonar signals
on your screen. This sonar unit will work fine right out of the box with
the factory default settings. But, if you want to learn about the various
sonar options, see Sec. 4, Sonar Options & Other Features. (For general
system setup and GPS options, see Sec. 8, System Setup and GPS Setup
Options.)
You can access the Main Menu from any of the four Page screens by
pressing MENU MENU| . To clear the menu screen and return to the page
display, press EXIT. (Remember, our text style for "MENU MENU| " means
"press the Menu key twice." See a full explanation of our instruction
text formatting on pages 11, "How to use this manual."
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44
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 Satel-
lite Status Page: Press the PAGES key, then use ←
←
←
←← →
→
→
→→ to select STATUS.
This page represents a GPS function, so it is discussed in much greater
detail in Sec. 6.
No matter what Page you are on, a flashing current position indica-
tor/question mark symbol and flashing GPS data displays indicate sat-
ellite 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 showing satellite lock-on with a 3D position
acquired (latitude, longitude and altitude), including WAAS reception.
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45
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 Navi-
gation Page, press PAGES|←
←
←
←← →
→
→
→→ to NAVIGATION|EXIT.
This page represents a GPS function, but also has a navigation with
sonar option, which will keep you updated on what is under your boat
as well as where you are going.
Navigation page with Sonar (left). Navigation Page with digital data,
recording a trail, traveling southwest (right).
Map Page
The Map Page screens show your course and track from a bird's-eye
view, on a moving map. By default, this unit shows the map with north
always at the top of the screen. The arrow in the center of the screen is
your present position. It points in the direction you are traveling.
Map Page showing position on Bull Shoals Lake, Arkansas. The full
map option (left). Map with sonar option (right).
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46
Map Page is also the default screen that appears when you turn on the
unit. To get to the Map Page from another page, press PAGES|←
←
←
←←
→
→
→
→→ 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 ←
←
←
←← →
→
→
→→ to select
SONAR. The Pages Menu also offers five chart display options under the
Sonar Page category. To access them, press PAGES|←
←
←
←←
→
→
→
→→ to SONAR|↓
↓
↓
↓↓ to
Option Name| EXIT.
The Sonar Page has its own menu, which is used for some advanced
functions and for setting various options. (Sonar Options and other fea-
tures are discussed in Sec. 4.) To Access the Sonar Page menu, from the
Sonar Page press MENU.
Pages Menu (left) showing sonar display options.
Full sonar chart display mode (right).
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48
Sonar Page in full sonar chart mode.
You can customize how the Sonar Page displays its pictures and other
data in many ways.
We'll discuss all of those features and options in Sec. 4, but to show you
how easy this unit is to operate, the following page contains a 10-step
quick reference that will cover most fish finding situations. The quick
reference describes how your unit will operate with all the sonar fea-
tures 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
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54
Notes
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56
Alarms
This unit has three different types alarms, Sonar, GPS and NMEA
2000. There are three Sonar alarms: Fish Alarm, Zone Alarm and
Depth Alarm.
The Fish Alarm will sound when the Fish I.D. feature determines an
echo is a fish. The Zone Alarm consists of a blue bar on the side of the
screen. Any echo on the chart that appears inside this bar triggers the
alarm. The Depth Alarm has both a Shallow and a Deep setting. Only
the bottom signal will trigger this alarm. It is most useful as an anchor
watch or shallow water alert.
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 set-
ting. 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 ↑
↑
↑
↑↑ ↓
↓
↓
↓↓ to change the first number, then press →
→
→
→→ to the next num-
ber and repeat until the depth is correct, then press ENT.
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62
Sonar Page menu with Depth Cursor selected (left). Sonar chart with
active depth cursor (right). The cursor is set at 34.64 feet deep.
The cursor can be moved to any location on the screen, letting you pin-
point the depth of a target.
1. From the Sonar Page, press MENU|↓
↓
↓
↓↓ to D CEPTH URSOR|ENT.
2. The depth cursor appears. Press move the Depth Cursor.
↓
↓
↓
↓↓ ↑
↑
↑
↑↑
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. pending upon the bottom depth and
the current range, you can change the range to a different depth.
Sonar Page menu with Depth Range command selected (left). The
Depth Range Control Scale (right).
Cursor line Depth box
![](https://manualstech.ams3.cdn.digitaloceanspaces.com/html/nl/lowrance/lms339c/html/bg47.png)
63
1. From the Sonar Page, press MENU|↓
↓
↓
↓↓ to D REPTH ANGE|ENT.
2. The Depth Range Control Scale appears. Press ↑
↑
↑
↑↑ ↓
↓
↓
↓↓ to select a differ-
ent depth range. A blue bar highlights the selected range. The shaded
numbers cannot be selected.
3. When the new range is selected, press EXIT to close the menu.
Depth Range - Manual
You have complete control over the range when the unit is in the man-
ual mode. There are 16 depth ranges, from 5 to 4,000 feet.
To switch to Manual Depth Range:
1. First, turn off automatic depth range. From the Sonar Page, press
MENU|↓
↓
↓
↓↓ to A D RUTO EPTH ANGE|ENT.
2. Press ↑
↑
↑
↑↑ to D REPTH ANGE|ENT and the Depth Range Control Scale ap-
pears.
3. Press ↓
↓
↓
↓↓ ↑
↑
↑
↑↑ to select a different depth range. A blue bar highlights the
selected range.
4. When the new range is selected, press EXIT to close the menu.
NOTE:
The sonar's depth capability depends on the water, bottom condi-
tions, transducer installation and other factors.
Depth Range - Upper and Lower Limits
Virtually any segment of the water column can be displayed by using
the upper and lower limit feature. This lets you pick the shallow and
deep depth range limits that are shown on the screen, provided there is
at least 10 feet between the upper and lower limit you select. For ex-
ample, a range from 12 feet to 34 feet could be used.
Changing the upper and lower limits gives you far greater control over
the depth range. This feature lets you zoom in the display in almost
unlimited combinations. Nearly any segment of the water column, from
the surface to the bottom can be shown.
Specyfikacje produktu
Marka: | Lowrance |
Kategoria: | Radar statku |
Model: | LMS339C |
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