Lowrance M68C S/Map Manual

Lowrance Navigator M68C S/Map

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Pub. 988-0152-031

www.lowrance.com

M68C S/Map &

M68C IceMachine

Fish-finding Sonar & Mapping GPS

Installation and Operation

Instructions





Table of Contents

Sec. 1: Read Me First! .............................................................. 1

Capabilities and Specifications: M68............................................ 3

How your Sonar Works................................................................. 4

How your GPS Works ................................................................... 5

Introduction to GPS and WAAS................................................... 5

How to Use this Manual: Typographical Conventions................ 7

Sec. 2: Installation & Accessories .......................................... 9

Preparations.................................................................................. 9

Transducer Installation................................................................ 9

Recommended Tools and Supplies ......................................... 10

Selecting a Transducer Location................................................ 10

How Low Should You Go?....................................................... 11

Shoot-Thru-Hull vs. Transom Mounting ............................... 12

Transom Transducer Assembly and Mounting ......................... 13

Trolling Motor Bracket Installation........................................... 16

Transducer Orientation and Fish Arches.................................. 17

Shoot-Thru-Hull Preparation and Installation ......................... 18

Power and Cable Connections.................................................... 22

Mounting the Sonar Unit: In-Dash or Bracket ......................... 23

Portable Sonar Installation........................................................ 27

Portable Transducer Assembly .............................................. 29

Sec. 3: Basic Sonar Operation.............................................. 31

Keyboard Basics.......................................................................... 31

Memory........................................................................................ 32

Menus .......................................................................................... 32

Main Menu .............................................................................. 32

Sonar Menu ............................................................................. 33

Pages ........................................................................................... 35

Basic Sonar Quick Reference ............................................... 37

Sonar Operations ........................................................................ 38

Fish Symbols vs. Full Sonar Chart ........................................ 40

Other Free Training Aids ....................................................... 41

Sec. 4: Sonar Options & Other Features ........................... 43

ASP (Advanced Signal Processing)......................................... 43

Alarms ......................................................................................... 44

Depth Alarms .......................................................................... 44

Zone Alarm.............................................................................. 45

Fish Alarm............................................................................... 46

Chart Speed................................................................................. 47

ColorLine.................................................................................. 47

Depth Cursor............................................................................... 49

Depth Range - Automatic ........................................................... 49

Depth Range - Manual................................................................ 50

Turn Auto Depth Range on Again:..................................... 50

Depth Range - Upper and Lower Limits ................................... 50

FasTrack .................................................................................. 52

Fish I.D. (Fish Symbols & Depths) ......................................... 52

FishTrack ................................................................................. 53

Overlay Data............................................................................... 54

Change Displayed Data Font Size: ........................................ 55

Ping Speed & HyperScroll....................................................... 56

Reset Options.............................................................................. 57

Sensitivity & Auto Sensitivity.................................................... 58

Turn Auto Sensitivity Back on:.............................................. 59

Set Keel Offset ............................................................................ 59

Sonar Color Mode........................................................................ 60

Sonar Page & Sonar Chart Display Options ............................. 61

Full Sonar Chart ..................................................................... 61

Split Zoom Sonar Chart.......................................................... 61

Digital Data/Chart .................................................................. 62

Flasher..................................................................................... 62

Sonar Simulator.......................................................................... 63

Stop Chart ................................................................................... 63

Surface Clarity ............................................................................ 64

Zoom Pan..................................................................................... 65

Sec. 5: Ice Fishing.................................................................... 67

Icemachine Mode Operation....................................................... 68

Sensitivity ............................................................................... 70

Colorline.............................................................................. 71

Battery Gauge ......................................................................... 72

Sonar Signal Interpretation ....................................................... 72

Ice Flasher Options..................................................................... 73

Split Zoom Display Mode........................................................ 73

Color Modes............................................................................. 74

Scouting Through the Ice ........................................................... 75

Sec. 6: Sonar Troubleshooting.............................................. 77

Sec. 7: Basic GPS Operations................................................ 81

Keyboard ..................................................................................... 81

Power/Lights (Turn Unit On and Off) ....................................... 82

Main Menu .................................................................................. 82

Pages ........................................................................................... 84

Sonar Page .............................................................................. 84

Satellite Status Page .............................................................. 84

Navigation Page...................................................................... 86

Full Map Page ......................................................................... 88

iii

GPS Quick Reference ............................................................. 91

Find your Current Position ........................................................ 92

Moving around the Map: Zoom & Cursor Arrow Keys.............. 92

Selecting any Map Item with the Cursor .................................. 93

Set a Waypoint............................................................................ 93

Create Waypoint at Current Position.................................... 93

Create Waypoint on Map........................................................ 94

Create Waypoint by Entering a Position ............................... 95

Navigate to a Waypoint .............................................................. 95

Set Man Overboard (MOB) Waypoint........................................ 96

Navigate Back to MOB Waypoint.............................................. 96

Navigate to Cursor Position on Map.......................................... 97

Navigate to a Map Place............................................................. 99

Creating and Saving a Trail....................................................... 99

Displaying a Saved Trail .......................................................... 101

Navigating Trails...................................................................... 101

Visual Trailing ...................................................................... 102

Navigate a Trail (Forward)................................................... 102

Navigate a Back Trail (Backtrack, or Reverse) ................... 104

Cancel Navigation..................................................................... 105

Sec. 8: Advanced GPS Operations .....................................107

Find Distance from Current Position to Another Location .... 107

Find Distance from Point to Point ........................................... 107

Icons........................................................................................... 107

Create Icon on Map............................................................... 108

Create Icon at Current Position........................................... 108

Delete an Icon ....................................................................... 108

Navigate to an Icon ............................................................... 109

Routes........................................................................................ 109

Create and Save a Route ...................................................... 110

Delete a Route ....................................................................... 112

Edit a Route .......................................................................... 112

Navigate a Route................................................................... 113

Navigate a Route in Reverse ................................................ 114

Trails ......................................................................................... 115

Delete a Trail ........................................................................ 115

Edit a Trail Name ................................................................. 115

Edit a Trail Color .................................................................. 116

Edit a Trail Pattern .............................................................. 116

Utilities...................................................................................... 116

Alarm Clock........................................................................... 116

Sun/Moon Rise & Set Calculator.......................................... 116

Trip Calculator...................................................................... 116

Trip Down Timer................................................................... 116

Trip Up Timer ....................................................................... 117

Waypoints.................................................................................. 117

Delete a Waypoint................................................................. 117

Edit a Waypoint (Name, Symbol and Position) ................... 117

Selecting a Waypoint ............................................................ 118

Set a Waypoint by Average Position .................................... 118

Set a Waypoint by Projecting a Position.............................. 118

Sec. 9: System & GPS Setup Options................................. 119

Alarms ....................................................................................... 119

Auto Satellite Search................................................................ 120

Coordinate System Selection.................................................... 121

Map Fix ..................................................................................... 122

Customize Page Displays ......................................................... 124

Customize Map or Navigation Page..................................... 124

Customize Position Page ...................................................... 124

GPS Simulator .......................................................................... 125

Simulating Trail or Route Navigation ................................. 126

Initialize GPS............................................................................ 126

Map Auto Zoom......................................................................... 127

Map Data................................................................................... 127

Earth Map Detail .................................................................. 127

Pop-Up Map Info................................................................... 128

Fill Water with White........................................................... 128

Map Overlays (Range Rings; Lat/Long Grid) ...................... 128

Map Datum Selection ............................................................... 128

Map Detail Category Selection................................................. 129

Map Orientation ....................................................................... 130

Overlay Data............................................................................. 131

Pop-Up Help.............................................................................. 133

Reset Options............................................................................ 134

Screen Contrast and Brightness .............................................. 134

Set Language ............................................................................ 135

Set Local Time .......................................................................... 135

Show WAAS Alarm................................................................... 136

Software Version Information.................................................. 136

Sounds and Alarm Sound Styles.............................................. 137

Track Smoothing....................................................................... 138

Trail Options ............................................................................. 138

Delete All Trails .................................................................... 139

Update Active Trail Option .................................................. 139

Update Trail Criteria (Auto, Time, Distance).................. 139

Trail Update Rate (Time, Distance)................................. 139

Delete Trail ........................................................................... 140

New Trail............................................................................... 140

Trail Visible/Invisible and Other Trail Options .................. 141

Transparency ............................................................................ 141

Units of Measure....................................................................... 142

Sec. 10: Searching................................................................. 143

Find any Item Selected by Map Cursor ................................... 143

Find Map Places........................................................................ 144

Find Streets or Intersections.................................................... 146

Find Waypoints......................................................................... 150

Sec. 11: Supplemental Material..........................................153

Index......................................................................................... 159

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.

Notes

Section 1:

Read Me First!

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

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

you're anxious to begin finding fish, but we have a favor to ask. Before

you grab the unit and begin installing it, please give us a moment or

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

from your combination fish finder and GPS receiver.

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

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

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

navigation and sonar tasks.

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 11 sections. This first section is an intro-

duction to the M68 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, as well as the transducer (the

most important part of any sonar installation). 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 37 and head

for the water with your unit!)

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

check out Section 4, which discusses more advanced Sonar Options and

Other Features.

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

look it up in the manual by skimming over the table of contents or the in-

dex, or just flipping through Section 3 or scanning through the sonar op-

tions in Section 4.

Section 5 is a brief introduction to the powerful ice fishing applications of

the M68C and M68C IceMachine. (See section 2 to learn how you can get

the most out of your M68C with the addition of a special portable power

pack for ice fishing.)

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

the most common problems in Section 6, Sonar Troubleshooting.

The manual switches from sonar to navigation in Section 7, which in-

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

page GPS Quick Reference on page 91.

Section 7 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 8, Advanced GPS Opera-

tions. This section contains the rest of the unit's GPS command func-

tions, 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 or index, just flipping

through Section 7 or scanning through the command portion of Section 8.

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

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

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

such as screen brightness settings, affect both sonar and GPS opera-

tions. We describe how to use those common options along with GPS

options in Section 9, System Setup and GPS Setup Options. Section 9 is

organized in alphabetical order.

In Section 10, we go into more detail on one of the unit's most remarkable

GPS capabilities — Searching. There are so many map items you can

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

Finally, in Section 11, 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-

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 it can

store, skip ahead to important information on how sonar works, on page

4. (Background on GPS begins on page 5.)

Capabilities and Specifications: M68

General

Display:............................ High-contrast Film SuperTwist LCD. Diago-

nal viewing area: 3.5" (8.9 cm).

Resolution:...................... 160 pixel x 240 pixel resolution; 38,400 total

pixels.

Backlighting:.................. LED backlit screen with multiple lighting lev-

els; backlit keypad.

Input power:................... 10 to 17 volts DC.

Current drain: ............... 170 ma lights off; 240 ma lights on.

Case size:......................... 5.8" H x 4.3" W x 2.5" D (14.7 cm H x 10.8 cm

W x 6.6 cm D) sealed, waterproof; suitable for

saltwater use.

Back-up memory: .......... Built-in memory stores GPS data for dec-

ades. User settings are stored when unit is

turned off.

Languages:...................... 10; menu languages selectable by user.

Sonar

Frequency:...................... 200 kHz.

Transducer:...................... A Skimmer transducer comes packed with

your sonar unit. Its 20° cone angle offers a

wide fish detection area of up to 60º with

high sensitivity settings. Operates at boat

speeds up to 70 mph (61 kts).

Transmitter: ................... 800 watts peak-to-peak; 100 watts RMS.

Sonar sounding

depth capability: ........... 600 feet (180 meters). Actual capability de-

pends on transducer configuration and in-

stallation, bottom composition and water con-

ditions. All sonar units typically read deeper

in fresh water than in salt water.

Depth display:................ Continuous display.

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.

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.

How Your GPS Works

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

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

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

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

& Accessories on page 9. 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 this unit easy to use, so you don't need to be a computer

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

menus so you can tell it what to do. The screen also lets the unit show your

location on a moving map, as well as point the way to your destination.

This unit uses an internal antenna/receiver module, which makes the

whole system work something like your car radio. But instead of your

favorite dance tunes, this receiver tunes in to a couple of dozen GPS

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

in orbit, but more about that in the upcoming segment introducing you

to GPS and WAAS.)

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

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

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

the unit plots that position on the GPS screen. The whole process takes

place several times a second!

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, and retrace

your path. 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 dif-

ferent GPS data files, erase 'em and record new ones, over and over again.

Introduction to GPS and WAAS

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

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

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 naviga-

tion, 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 identi-

fies 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.

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, this 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 for the

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

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

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

data shown on the display.

GPS 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 automati-

cally 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.

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:

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 this unit are described as a sequence

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

condensed manner for quick and easy reading.

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

1. From the Plotter 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 navi-

gation information along the trail. Now, begin moving and follow

your unit's directions.

Translated into complete English, step 1 above would mean: "Start on

the Plotter 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."

Section 2:

Installation & Accessories

Preparations

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

prefer, but we recommend this installation sequence:

CAUTION:

You should read over this entire installation section before drill-

ing 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 power/transducer cable. This will

help you make sure you have enough cable length for the desired con-

figuration.

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

route.

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 so-

nar/GPS 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 to the unit and mount the so-

nar/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. Please read all instruc-

tions before proceeding with any installation.

Your Skimmer transducer typically comes packaged with a one-piece

stainless steel bracket for mounting it to the transom of your boat. The

optional trolling motor mount uses a one-piece plastic bracket with an

adjustable strap. These are "kick-up" mounting brackets. They help pre-

vent damage if the transducer strikes an object while the boat is moving.

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

into place without tools.

Read these instructions carefully before attempting the installation.

Determine which of the installation methods is right for your boat.

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 the transducer 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.

1. Assembling the bracket. Press the two small plastic ratchets into the

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

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

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

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

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

Align plastic ratchets in bracket.

2. Aligning the transducer on the transom. Slide the transducer

between the two ratchets. Temporarily slide the bolt though the

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

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

is parallel to the ground. If it does, then the "A" position is correct for

your hull.

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

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

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

in the bracket.

Dot

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 3. If it doesn't,

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

the transducer on the transom correctly.

Insert bolt and check transducer position on transom.

3. Assembling the transducer. Once you determine the correct posi-

tion for the ratchets, assemble the transducer as shown in the fol-

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

Assemble transducer and bracket.

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 using the #29 bit (for the #10 screws).

Ratchets

Nut

Metal

washer

Metal washer

Bolt

Rubber

washers

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.

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

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

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

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

and needs to be raised.

NOTE:

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

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

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

rectly 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.

Fill with polyester resin

Inner hull

Epoxy to hull first Outer hull

Flotation material

Produkt Specifikationer

Mærke:	Lowrance
Kategori:	Navigator
Model:	M68C S/Map

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