Lowrance electronic LMS-525C DF User Manual

Pub. 988-0151-461

www.lowrance.com

LMS-520C & LMS-525C DF

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. Any unauthorized commercial distribution of this manual is strictly prohibited.

Lowrance® is a registered trademark of Lowrance Electronics, Inc. MapCreate™, FreedomMaps™ and NauticPath™ are trademarks of LEI. Fishing Hot Spots® is a registered trademark of Fishing Hot Spots Inc. LakeMaster® and Pro Maps are trademarks or registered trademarks of WayPoint Technologies, Inc. Navionics® is a registered trademark of Navionics, Inc. DURACELL® is a registered trademark of Duracell, Inc. RAYOVAC® is a registered trademark of Rayovac Corporation. Energizer® and e2® are registered trademarks of Energizer Holdings, Inc.

Points of Interest Data in this unit are by infoUSA, copyright © 2001-2006, All Rights Reserved. infoUSA is a trademark of infoUSA, Inc.

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-525CDF.

For free owner's manuals and the most current information on this product, its operation and accessories,

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
Specifications: LMS-520c and LMS-525cDF..........................	3
How to use this manual: typographical conventions ................	10
Section 2: Installation.............................................................	13
Preparations ................................................................................	13
Transducer Installation ..............................................................	13
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) 23
Transducer Orientation and Fish Arches..............................	23
Shoot-Thru-Hull Preparation.................................................	24
Hulls with Flotation Materials...........................................	24
Testing Determines Best Location.........................................	25
Shoot-thru-hull Installation ...................................................	27
Speed/Temperature Sensors .................................................	28
Optional Speed Sensor Installation .......................................	28
Power Connections......................................................................	30
Powering Your Display Unit ......................................................	31
Power Diagram A ........................................................................	32
Power Diagram B ........................................................................	33
Powering a NMEA 2000 Network Bus ......................................	33
GPS Antenna/Receiver Module ..................................................	34
Connecting to a NMEA 2000 Network ......................................	35
NMEA 0183 Wiring (Data cable) ...........................................	36
Mounting the Unit: Bracket, In-Dash or Portable....................	39
MMC or SD Card Memory Card Installation............................	42
Other Accessories ........................................................................	44
Cleaning Towel........................................................................	44
Face Cover ...................................................................................	45
Section 3: Basic Sonar Operation ........................................	47
Keyboard......................................................................................	47
Power/lights on and off ...............................................................	48
Main Menu...................................................................................	48
Pages ............................................................................................	50
Satellite Status Page...............................................................	50
Navigation Page ......................................................................	51
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Map Page .................................................................................	51
Sonar Page ...............................................................................	52
Basic Sonar Quick Reference ...............................................	55
Sonar Operations ........................................................................	56
Fish Symbols vs. Full Sonar Chart ........................................	58
Section 4: Sonar Options........................................................	61
ASP™ (Advanced Signal Processing).........................................	61
Alarms..........................................................................................	62
Depth Alarms ..........................................................................	62
Zone Alarm ..............................................................................	63
Fish Alarm ...............................................................................	64
GPS Alarms .............................................................................	65
NMEA 2000 Alarms ....................................................................	66
Calibrate Speed ...........................................................................	67
Chart Speed .................................................................................	68
Colorline™ ...................................................................................	69
Depth Cursor ...............................................................................	70
Depth Range - Automatic ...........................................................	71
Depth Range - Manual................................................................	71
Depth Range - Upper and Lower Limits ...................................	72
FasTrack™...................................................................................	73
Fish I.D.™ (Fish Symbols & Depths) .........................................	74
FishTrack™..................................................................................	76
Frequency (Change Transducer Frequency) .............................	76
HyperScroll™...............................................................................	77
Log Sonar Chart Data.................................................................	78
Noise Rejection ............................................................................	79
Overlay Data ...............................................................................	79
Ping Speed & HyperScroll™.......................................................	82
Reset Options...............................................................................	83
Reset Water Distance..................................................................	84
Set Keel Offset.............................................................................	84
Sensitivity & Auto Sensitivity....................................................	85
Automatic Sensitivity .............................................................	86
Sonar Chart Mode .......................................................................	87
Sonar Page & Sonar Chart Display Options .............................	88
Full Sonar Chart .....................................................................	88
Split Zoom Sonar Chart ..........................................................	89
Split Frequency Sonar Chart (LMS-525cDF only)................	89
Digital Data/Chart ..................................................................	90
Customize Page Displays........................................................	90
Flasher .....................................................................................	92
Sonar with Custom Gauges ........................................................	92
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Map with Sonar Split Screen..................................................	94
Sonar Simulator ..........................................................................	95
Stop Chart....................................................................................	97
Surface Clarity ............................................................................	98
Transparency...............................................................................	99
Upper and Lower Limits...........................................................	100
Zoom & Zoom Bar......................................................................	100
Zoom Pan ...................................................................................	100
Section 5: Sonar Troubleshooting .....................................	101
Section 6: Basic GPS Operations .......................................	105
Keyboard....................................................................................	105
Power/lights on and off .............................................................	106
Main Menu.................................................................................	106
Pages ..........................................................................................	108
Sonar Page .............................................................................	108
Satellite Status Page.............................................................	108
Navigation Page ....................................................................	110
Map Page ...............................................................................	113
Map with Sonar .....................................................................	117
Map with Custom Gauges.....................................................	118
Radar..........................................................................................	119
Basic GPS Quick Reference ................................................	121
Find Your Current Position......................................................	122
Moving Around the Map: Zoom & Cursor Arrow Keys...........	122
Selecting Any Map Item with the Cursor................................	123
Searching ...................................................................................	123
Set a Waypoint ..........................................................................	125
Navigate To a Waypoint ...........................................................	127
Set Man Overboard (MOB) Waypoint......................................	127
Navigate Back to MOB Waypoint ............................................	128
Navigate to Cursor Position on Map........................................	128
Navigate to a Point of Interest .................................................	130
Creating and Saving a Trail .....................................................	130
Displaying a Saved Trail ..........................................................	132
Navigating Trails ......................................................................	133
Visual Trailing.......................................................................	133
Navigate a Trail ....................................................................	133
Navigate a Back Trail (backtrack) .......................................	135
Transfer Custom Maps and GPS Data Files...........................	136
Cancel Navigation.....................................................................	138
Section 7: Advanced GPS Operations..............................	139
Find Distance from different Locations...................................	139
Find Distance from Point to Point ...........................................	139
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Icons ...........................................................................................	140
Create Icon on Map ...............................................................	140
Create Icon at Current Position ...........................................	140
Delete an Icon........................................................................	140
Navigate to an Icon ...............................................................	141
Routes ........................................................................................	141
Create and Save a Route ......................................................	142
Delete a Route .......................................................................	144
Edit a Route Name................................................................	145
Edit Route Waypoints ...........................................................	145
Navigate a Route...................................................................	146
Navigate a Route in Reverse ................................................	146
Trails ..........................................................................................	147
Delete a Trail.........................................................................	147
Edit a Trail Name .................................................................	148
Edit a Trail Color ..................................................................	148
Edit a Trail Pattern...............................................................	148
Utilities ......................................................................................	149
Alarm Clock ...........................................................................	149
Sun/Moon Rise & Set Calculator..........................................	149
Trip Calculator ......................................................................	149
Trip Down Timer ...................................................................	149
Trip Up Timer........................................................................	149
Waypoints ..................................................................................	149
Edit a Waypoint.....................................................................	150
Selecting a Waypoint ............................................................	150
Create Waypoint by Entering a Position .........................	151
Set a Waypoint by Average Position....................................	152
Set a Waypoint by Projecting a Position..............................	152
Section 8: System & GPS Setup Options..........................	153
Alarms........................................................................................	153
Auto Satellite Search ................................................................	154
Check MMC Files and Storage Space......................................	155
Communications Port Configuration.......................................	155
Configure NMEA.......................................................................	156
Coordinate System Selection....................................................	156
Map Fix ......................................................................................	158
Customize Page Displays..........................................................	159
GPS Simulator...........................................................................	160
Hide GPS Feature .....................................................................	162
Initialize GPS ............................................................................	162
Map Auto Zoom .........................................................................	163
Map Data ...................................................................................	163
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Map Datum Selection................................................................	165
Map Detail Category Selection.................................................	166
Map Orientation........................................................................	166
NauticPath™ USA Marine Charts...........................................	168
Nautical Chart Notes ............................................................	168
Port Information....................................................................	169
Tidal Current Information....................................................	170
Tide Information ...................................................................	172
Navionics® Charts .....................................................................	173
Overlay Data .............................................................................	174
Pop-up Help ...............................................................................	178
Reset Options.............................................................................	179
Screen Contrast and Brightness ..............................................	180
Set Language.............................................................................	181
Set Local Time...........................................................................	181
Show WAAS Alarm ...................................................................	182
Software Version Information..................................................	183
Sounds and Alarm Sound Styles..............................................	184
Track Smoothing .......................................................................	185
Trail Options..............................................................................	185
Update Trail Option..............................................................	186
Trail Visible/Invisible and Other Trail Options..................	188
Transparency.............................................................................	188
Units of Measure .......................................................................	189
Section 9: Searching..............................................................	193
Find Streets ...............................................................................	194
Find Any Item Selected by Map Cursor ..................................	195
Find Interstate Highway Exits ................................................	195
Find Map Places or Points of Interest (POI) ...........................	198
Find Streets or Intersections....................................................	200
Find Waypoints .........................................................................	203
Section 10: NMEA 2000 Device Configuration................	207
NMEA 2000 Menu.....................................................................	207
Bus Setup...................................................................................	207
Engine & Tank Configuration..................................................	208
Tank Select ........................................................................	209
Tank Size ...........................................................................	209
Set Configuration button ..................................................	209
Device Configuration Menu..................................................	210
Device Information and Device Data ...................................	210
Fuel Management Menu...........................................................	211
Tank Location....................................................................	211
Fuel Added.........................................................................	211
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Add Fuel.............................................................................	212
Fill Tank.............................................................................	212
Adding Fuel to Tank .............................................................	212
Engine Operations.................................................................	212
Engine Select .....................................................................	212
NMEA 2000 Alarms ..................................................................	213
Waypoint Sharing .....................................................................	214
Backlight Synchronization .......................................................	214
Configuring EP Sensors............................................................	215
EP-35 Temperature Configuration ......................................	215
Advanced Options menu .......................................................	216
Instance..............................................................................	216
Restore Defaults ................................................................	216
EP-10 Fuel Flow Configuration............................................	216
Advanced Options menu .......................................................	217
Instance..............................................................................	217
Restore Defaults ................................................................	217
To restore default settings:...............................................	218
EP-15 Fluid Level Configuration .........................................	218
Advanced Options menu .......................................................	220
Instance..............................................................................	220
Restore Defaults ................................................................	220
Suzuki Engine Interface Configuration...............................	221
Advanced Options menu .......................................................	222
Instance..............................................................................	222
Restore Defaults ................................................................	222
Calibrating EP Sensors.............................................................	223
EP-10 Fuel Flow Calibration................................................	223
EP-15 Fluid Level Calibration .............................................	224
2-Point Calibration............................................................	224
3-Point Calibration............................................................	225
5-Point Calibration............................................................	226
Fuel Flow Calibration in a Suzuki Engine Interface..........	227
Engine Trim Calibration.......................................................	228
Reset Trim Calibration .........................................................	229
Bennett Trim Tabs Calibration............................................	229
Section 11: Supplemental Material ...................................	231

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NOTICE!

The storage and operation temperature range for your unit is from -20 degrees to +167 degrees Fahrenheit (-28 degrees to +75 degrees Celsius). Extended storage or operation in temperatures higher or lower than specified will damage the liquid crystal display in your unit. This type of damage is not covered by the warranty. For more information, contact the factory's Customer Service Department; phone numbers are listed on the last page of the manual.

WARNING!

A CAREFUL NAVIGATOR NEVER RELIES ON ONLY ONE METHOD TO OBTAIN POSITION INFORMATION.

CAUTION

When showing navigation data to a position (waypoint), a GPS unit will show the shortest, most direct path to the waypoint. It provides navigation data to the waypoint regardless of obstructions. Therefore, the prudent navigator will not only take advantage of all available navigation tools when traveling to a waypoint, but will also visually check to make sure a clear, safe path to the waypoint is always available.

WARNING!

When a GPS unit is used in a vehicle, the vehicle operator is solely responsible for operating the vehicle in a safe manner. Vehicle operators must maintain full surveillance of all pertinent driving, boating or flying conditions at all times. An accident or collision resulting in damage to property, personal injury or death could occur if the operator of a GPSequipped vehicle fails to pay full attention to travel conditions and vehicle operation while the vehicle is in motion.

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Notes

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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 discover that your unit is easy to use, yet capable of handling demanding navigation and sonar tasks. When you team your unit with our custom mapping software MapCreate™, 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. Here's how:

The manual is organized into 10 sections. This first section is an introduction to the LMS-520c and LMS-525cDF, 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, the transducer and the GPS antenna module. 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 figured out how to install the unit yourself, and you just can't wait any longer, turn to the Quick Reference on page 55 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 flipping through Section 3 or scanning through the sonar options in Section 4.

If you're having difficulty with your sonar, you can find an answer to the most common problems in Section 5, Sonar Troubleshooting.

The manual switches from sonar to navigation in Section 6, which introduces you to Basic GPS Operations. This section features a onepage GPS Quick Reference on page 121.

Section 6 contains short, easy-to-scan GPS lessons that follow one another in chronological order. They're all you'll need to know to find your way on the water quickly.

After you've learned the basics (or if you already have some GPS experience), you may want to try out some of the unit’s many advanced navigation features. That brings us to Section 7, Advanced GPS Operations. This section contains the rest of your unit’s GPS command functions, organized in alphabetical order.

When you come to a GPS menu command on the screen, you can look it up in the manual by skimming over the table of contents, just 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 operations. We describe how to use those common options along with GPS options in Section 8, System Setup and GPS Setup Options. Section 8 is organized in alphabetical order.

In Section 9, we go into more detail on one of the unit’s most remarkable GPS capabilities — Searching. We'll introduce a search example in the Basic GPS Operation section, but there are so many map items you can search for, we had to give this function 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.

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Specifications: LMS-520c and LMS-525cDF

	General
Display: ............................	5.0" (12.7 cm) diagonal high contrast color
	Film SuperTwist LCD; programmable to
	viewing preference.
Resolution: ......................	480 pixel x 480 pixel resolution; 230,400 to-
	tal pixels.
Backlighting: ..................	Incandescent backlit screen with multiple
	lighting levels; backlit keypad.
Input power: ...................	10 to 15 volts DC.
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 salt-
	water 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-525cDF: 50/200 kHz.
	LMS-520c: 200 kHz.
Transducers: .....................	A dual-frequency Skimmer® transducer with
	built-in temperature sensor is packed with the
	LMS-525cDF. It has 35°/12° cone angles. A
	single-frequency Skimmer transducer with
	built-in temperature sensor is packed with the
	LMS-520c. It has a 20° cone angle. Transduc-
	ers operate at speeds up to 70 mph (61 kts).
Transmitter:....................	3,000 watts peak-to-peak/375 watts RMS.
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Sonar sounding	LMS-525cDF: 2,500 feet/762 meters.
depth capability:............
	LMS-520c: 1,000 feet/305 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 1 GB on one MMC (or SD) card
Audible alarms:..............	Deep/shallow/fish/zone.
Automatic ranging: .......	Yes, with instant screen updates.
Auto bottom track: ........	Yes
Zoom bottom track:.......	Yes.
Split-screen zoom: .........	Yes.
Surface water temp: .....	Yes, built into transducer.
Speed/distance log: .......	Yes, with optional speed sensor (sensor in-
	cluded with LMS-525cDF.)
	GPS
Receiver/antenna:............	External; LGC-2000 12 parallel channel
	NMEA 2000-ready GPS/WAAS re-
	ceiver/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.
Custom mapping:...........	MapCreate™ software optional; optional plug
	and play LEI FreedomMaps™ offer the same
	high-detail without the computer work of
	MapCreate. Other plug and play mapping
	options include IMS™ Fishing Hot Spots®,
	LEI NauticPaths™ charts and Navionics®
	charts.
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Mapping memory: ...........	Up to 1 GB on one MMC (or SD) card.
Position updates:...........	Every second.
Position points:..............	1,000 waypoints; 1,000 event marker icons.
Audible alarms:..............	Arrival/off-course/anchor.
Graphic symbols for
waypoints or event	63.
marker icons:..................
Routes: .............................	100; up to 100 waypoints per route.
Plot Trails:.......................	10 savable; up to 9,999 points per trail.
Zoom range: ....................	39 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.

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 NAvigation and Ranging, a technology developed during World War II for tracking enemy submarines. (Lowrance developed the world's first transistorized sportfishing sonar in 1957.) A sonar consists of a transmitter, transducer, receiver and display. In simple terms, here's how it finds the bottom, or the fish:

The transmitter emits an electrical impulse, which the transducer converts into a sound wave and sends into the water. (The sound frequency can't be heard by humans or fish.) The sound wave strikes an object (fish, structure, bottom) and bounces back to the transducer, which converts the sound back into an electrical signal.

The receiver amplifies this return signal, or echo, and sends it to the display, where an image of the object appears on the scrolling sonar chart. The sonar's microprocessor calculates the time lapse between the transmitted signal and echo return to determine the distance to the object. The whole process repeats itself several times each second.

Your 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

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also called sonar charts or sonar graphs.) You can replay this sonar log in the unit using the Sonar Simulator function, or play it back on a personal computer using our free Sonar Viewer. The viewer is available for download from the Lowrance web site, www.lowrance.com.

You can save several different sonar log files, erase 'em and record new ones, over and over again. The size of your sonar recordings 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 going. 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 computer 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 destination.

This gimbal-mounted unit uses an external antenna/receiver module, which makes the whole system work something like your car radio. But instead of your favorite dance tunes, this receiver tunes in to a couple of dozen GPS satellites circling the earth. (It will also listen in to the WAAS satellites in orbit, but more about that in the upcoming segment introducing you to GPS and WAAS.)

Your unit listens to signals from as many satellites as it can "see" above the horizon, eliminates the weakest signals, then computes its location in relation to those satellites. Once the unit figures its latitude and longitude, it plots that position on the moving map shown on the screen. The whole process takes place several times a second!

The performance doesn't stop there. Stored in the permanent memory of 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 mapmaking software, MapCreate™. 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 differences in Section 6, Basic GPS Operations, on page 105.

Another portion of the unit’s onboard memory is devoted to recording GPS navigation information, which includes waypoints, event marker

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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-520c and LMS-525cDF, 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 SDC (Secure Digital card) flash memory card. These solid-state memory devices are about the size of a postage stamp, but can hold data ranging from 8 MB to 1 GB. (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 removable (like a floppy disk or a cassette tape), you can store these GPS Data Files on a personal computer equipped with an MMC card reader. (Or store them on a pocketful of MMCs, if you don't have a computer.) Our MapCreate mapping software can save, edit or create its own GPS Data Files, which can be copied to the MMC and then loaded from the MMC into 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, custom maps, which you can produce on your computer with our MapCreate software. These MapCreate custom maps contain much greater detail than the basic background map. These Custom Map Files (file format *.lcm) not only may be shared between the LMS-520c and 525cDF, 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 between your gimbal-mounted unit and the hand-held iFINDER™ GPS receiver.)

Your unit automatically reads Custom Map Files directly from the MMC or SDC. To use a custom map, all you need to do is slide an MMC containing a map into the unit.

Introduction to GPS and WAAS

Well, now you know the basics of how your unit does its work. You might be ready to jump ahead to Section 2, Installation & Accessories,

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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 10. But, if you want to understand the current state of satellite navigation, look over this segment describing how GPS and its new companion WAAS work together to get you where you're going.

The Global Positioning System (GPS) was launched July 17, 1995 by the United States Department of Defense. It was designed as a 24- hour-a-day, 365-days-a-year, all weather global navigation system for the armed forces of the U.S. and its allies. Civilian use was also available 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 government discontinued SA on May 2, 2000, after the military developed other methods to deny GPS service to enemy forces. Reliable accuracy for civilian users jumped from 100 meters (330 feet) under SA to the present level of 10 to 20 meters (about 30 to 60 feet.)

Twenty-four satellites orbit 10,900 nautical miles above the Earth, passing overhead twice daily. A series of ground stations (with precisely surveyed locations) controls the satellites and monitors their exact locations in the sky. Each satellite broadcasts a low-power signal that identifies the satellite and its position above the earth. Three of these satellites are spares, unused until needed. The rest virtually guarantee that at least four satellites are in view nearly anywhere on Earth at all times.

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

The system requires signal reception from three satellites in order to determine a position. This is called a 2D fix. It takes four satellites to determine both position and elevation (your height above sea level — also called altitude.) This is called a 3D fix.

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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 satellites 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 simply be more "wandering" of the data shown on the display.

GPS alone is plenty accurate for route navigation, but the U.S. Federal Aviation Administration has special aircraft navigation needs that go beyond 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 vertically and horizontally, but it consistently delivers accuracies within 1-2 meters horizontal and 2-3 meters vertical, according to the FAA. It does 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 consistently 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 available, 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

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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.

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 following paragraphs explain how to interpret the text formatting for those commands and other instructions:

Arrow Keys

The arrow keys control the movement of dotted cross-hair lines on your mapping screen called the cursor. The arrow keys also control a horizontal line depth cursor on the sonar screen. The arrow keys 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: ↓ ↑ ← →.

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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: ROUTE PLANNING. 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 MY TRAILS|ENT.

2.Press ↓ to Trail 1|ENT|→|↓ to NAVIGATE|ENT.

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

4.The wait message disappears and the unit begins showing navigation information along the trail.

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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Notes

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Section 2: Installation

Preparations

You can install the sonar and GPS systems in some other order if you prefer, but we recommend this installation sequence:

Caution:

You should read over this entire installation section before drilling any holes in your vehicle or vessel!

1.Determine the approximate location for the sonar/GPS unit, so you can plan how and where to route the cables for the antenna, transducer and power. This will help you make sure you have enough cable length for the desired configuration.

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

3.Determine the approximate location for the GPS antenna module and its cable route.

4.Determine the location of your battery or other power connection, along with the power cable route.

5.Install the transducer and route the transducer cable to the sonar/GPS unit.

6.Install the GPS antenna and route the antenna cable to the sonar/GPS unit.

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

8.Mount the sonar/GPS unit to 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 singleand dual-frequency Skimmer transducers. Please read all instructions before proceeding with any installation.

The smaller single-frequency Skimmers typically use a one-piece, stainless steel mounting bracket. The larger dual-frequency Skimmers typically use a two-piece, plastic mounting bracket. The trolling motor mount uses a one-piece plastic bracket with an adjustable strap.

These are all "kick-up" mounting brackets. They help prevent damage if the transducer strikes an object while the boat is moving. If the transducer does "kick-up," the bracket can easily be pushed back into place without tools.

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Read these instructions carefully before attempting the installation. Determine which of the mounting positions is right for your boat. Remember, the transducer installation is the most critical part of a sonar installation.

NOTE:

The following installation types also call for these recommended tools and required supplies that you must provide (supplies listed here are not included):

Single-frequency transom installations

Tools include: two adjustable wrenches, drill, #29 (0.136") drill bit, flathead screwdriver. Supplies: high quality, marine grade aboveor belowwaterline 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 aboveor below-waterline sealant/adhesive compound.

Single-frequency trolling motor installations

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

Shoot-through hull installations

Tools: these will vary depending on your hull's composition. Consult your boat dealer or manufacturer. Other tools are a wooden craft stick or similar tool for stirring and applying epoxy, and a paper plate or piece of cardboard to mix the epoxy on. Supplies: rubbing alcohol, 100 grit sandpaper, specially formulated epoxy adhesive available from LEI (see ordering information on the inside back cover). A sandwich hull also requires polyester resin.

Selecting a Transducer Location

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

2.The transducer must be placed in a location that has a smooth flow of water at all times. If the transducer is not placed in a smooth flow of water, interference caused by bubbles and turbulence will show on the sonar's display in the form of random lines or dots whenever the boat is moving.

NOTE:

Some aluminum boats with strakes or ribs on the outside of the hull create large amounts of turbulence at high speed. These boats typically have large outboard motors capable of propelling the boat

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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.

Deadrise less than 10°

Pad

Strakes

Left, vee pad hull; right, vee hull. A pod style transducer is shown here, but the principle is the same for Skimmers inside a hull.

4.If the transducer is mounted on the transom, make sure it doesn't interfere with the trailer or hauling of the boat. Also, don't mount it closer than approximately one foot from the engine's lower unit. This will prevent cavitation (bubble) interference with propeller operation.

5.If possible, route the transducer cable away from other wiring on the boat. Electrical noise from engine wiring, bilge pumps and aerators can be displayed on the sonar's screen. Use caution when routing the transducer cable around these wires.

CAUTION: Clamp the transducer cable to transom near the transducer. This will help prevent the transducer from entering the boat if it is knocked off at high speed.

Good location

	Poor location
Good
location	Good location
Poor angle

Good and poor transducer locations.

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How low should you go?

For most situations, you should install your Skimmer transducer so that its centerline is level with the bottom of the boat hull.

This will usually give you the best combination of smooth water flow and protection from bangs and bumps.

Transom

Transducer centerline

Hull bottom

Align transducer centerline with hull bottom.

However, there are times when you may need to adjust the transducer slightly higher or lower. (The slots in the mounting brackets allow you to loosen the screws and slide the transducer up or down.) If you frequently lose bottom signal lock while running at high speed, the transducer may be coming out of the water as you cross waves or wakes. Move the transducer a little lower to help prevent this.

If you cruise or fish around lots of structure and cover, your transducer may be frequently kicking up from object strikes. If you wish, you may move the transducer a little higher for more protection.

There are two extremes you should avoid. Never let the edge of the mounting bracket extend below the bottom of the hull. Never let the bottom – the face – of the transducer rise above the bottom of the hull.

Shoot-thru-hull vs. Transom Mounting

In a shoot-thru-hull installation, the transducer is bonded to the inside of the hull with epoxy. The sonar "ping" signal actually passes through the hull and into the water. This differs from a bolt-thru-hull installation (often called simply "thru-hull"). In that case, a hole is cut in the hull and a specially designed transducer is mounted through the hull with a threaded shaft and nut. This puts the transducer in direct contact with the water.

Typically, shoot-thru-hull installations give excellent high speed operation and good to excellent depth capability. There is no possibility of transducer damage from floating objects, as there is with a transommounted transducer. A transducer mounted inside the hull can't be knocked off when docking or loading on a trailer.

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However, the shoot-thru-hull installation does have its drawbacks. First, some loss of sensitivity does occur, even on the best hulls. This varies from hull to hull, even from different installations on the same hull. This is caused by differences in hull lay-up and construction.

Second, the transducer angle cannot be adjusted for the best fish arches on your sonar display. (This is not an issue for flasher-style sonars.) Lack of angle adjustment can be particularly troublesome on hulls that sit with the bow high when at rest or at slow trolling speeds.

Third, a transducer CAN NOT shoot through wood and metal hulls. Those hulls require either a transom mount or a thru-hull installation.

Fourth, if your Skimmer transducer has a built in temp sensor, it will only show the temperature of the bilge, not the water surface temp.

Follow the testing procedures listed in the shoot-thru-hull installation section at the end of this lesson to determine if you can satisfactorily shoot through the hull.

Transom Transducer Assembly And Mounting

The best way to install these transducers is to loosely assemble all of the parts first, place the transducer's bracket against the transom and see if you can move the transducer so that it's parallel with the ground.

The following instructions sometimes vary depending on the mounting bracket that came with your transducer. Single-frequency Skimmers come with a one-piece stainless steel bracket, while dual-frequency Skimmers come with a two-piece plastic mounting bracket. Use the set of instructions that fits your model.

1.Assembling the bracket.

A. One-piece bracket: Press the two small plastic ratchets into the sides of the metal bracket as shown in the following illustration. Notice there are letters molded into each ratchet. Place each ratchet into the bracket with the letter "A" aligned with the dot stamped into the metal bracket. This position sets the transducer's coarse angle adjustment for a

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

Dot

Align plastic ratchets in bracket.

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B. Two-piece bracket: Locate the four plastic ratchets in the transducer's hardware package. Press two ratchets into the sides of the plastic bracket and two on either side of the transducer as shown in the following illustrations. Notice there are letters molded into each ratchet.

Place the ratchets into the bracket with the letter "A" aligned with the alignment mark molded into the bracket. Place the ratchets onto the transducer with the letter "A" aligned with the 12 o'clock position on the transducer stem. These positions set the transducer's coarse angle adjustment for a 14° transom. Most outboard and stern-drive transoms have a 14° angle.

Alignment letters

Alignment

positions

Transducer

Transducer bracket

Insert and align ratchets.

Transducer Transducer bracket

Ratchet	Ratchet

Add ratchets to bracket and transducer.

2.Aligning the transducer on the transom.

A. One-piece bracket: Slide the transducer between the two ratchets. Temporarily slide the bolt though the transducer assembly and

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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.

Ratchets

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.

If the transducer's face isn't parallel with the ground, remove and disassemble the transducer and ratchets. Place the ratchets into the bracket holes with the letter "B" aligned with the bracket alignment mark. Place them on the transducer aligned with the 12 o'clock position on the transducer stem.

Reassemble the transducer and bracket and place them against the transom. Again, check to see if you can move the transducer so it's parallel with the ground. If you can, then go to step 3B. If it doesn't, repeat step 2B, but use a different alignment letter until you can place the transducer on the transom correctly.

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	Bolt	Lock washer
		Nut
	Flat washer	Flat washer

Assemble transducer and bracket.

3.Assembling the transducer.

A. One-piece bracket: Once you determine the correct position for the ratchets, assemble the transducer as shown in the following fig-

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

Metal Nut washer

Rubber	Metal washer
washers
	Bolt

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 transducer's centerline should be in line with the bottom of the hull. Don't let the bracket extend below the hull!

Mark the center of each slot for the mounting screw pilot holes. You will drill one hole in the center of each slot.

Drill the holes. For the one-piece bracket, use the #29 bit (for the #10 screws). For the two-piece bracket, use the #20 bit (for the #12 screws).

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