Instrukcja obsługi Eagle FishMark 640C

Eagle Echosondy FishMark 640C

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www.eaglesonar.com

Fish-Finding & Depth-Sounding Sonars

Installation and Operation

Instructions

Eagle®, FishMark® and SeaFinder® are registered trademarks of LEI

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

transmitted or distributed for any purpose, without prior written

consent of Eagle Electronics. Any unauthorized commercial

distribution of this manual is strictly prohibited.

Eagle 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:

SeaFinder® 640c DF shown. Other models covered in the manual are

similar.

For free owner's manuals and the most current information on

this product, its operation and accessories,

visit our web site:

www.eaglesonar.com

Eagle Electronics

P.O. Box 669

Catoosa, OK USA 74015

Printed in USA.

Table of Contents

Read Me First!...................................................................................1

Capabilities and Specifications: FishMark® 640c ..............................2

SeaFinder® 640c DF.............................................................................2

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

How to Use this Manual: Typographical Conventions.......................5

Arrow Keys.......................................................................................5

Keyboard ..........................................................................................5

Menu Commands.............................................................................5

Instructions = Menu Sequences......................................................5

Section 2: Installation & Accessories...........................................7

Preparations.........................................................................................7

Transducer Installation.......................................................................7

Recommended Tools and Supplies..................................................8

Selecting a Transducer Location.....................................................9

How low should you go?.................................................................10

Shoot-Thru-Hull vs. Transom Mounting......................................11

Transom Transducer Assembly and Mounting............................12

Trolling Motor Bracket Installation (single-frequency only).......19

Transducer Orientation and Fish Arches.....................................20

Shoot-Thru-Hull Preparation........................................................21

Testing Determines Best Location................................................22

Shoot-Thru-Hull Installation........................................................24

Speed/Temperature Sensors..............................................................26

Optional Speed Sensor Installation..................................................27

Power Connections.............................................................................29

Mounting the Unit: Bracket, In-Dash or Portable.......................31

Bracket Installation.......................................................................32

In-Dash Installation ......................................................................34

Portable Installation......................................................................34

Basic Sonar Operation..................................................................37

Keyboard ............................................................................................37

Power/lights on and off......................................................................38

Main Menu.........................................................................................39

Pages ..................................................................................................40

Basic Sonar Quick Reference......................................................45

Sonar Operations...............................................................................46

Fish Symbols vs. Full Sonar Chart...............................................50

Other Free Training Aids..............................................................50

Section 4: Sonar Options & Other Features.............................52

ASP (Advanced Signal Processing)................................................53

To change the ASP level................................................................54

Alarms................................................................................................54

Depth Alarms.................................................................................55

Zone Alarm.....................................................................................56

Fish Alarm......................................................................................57

Backlight and Contrast Level ...........................................................58

Calibrate Speed..................................................................................59

Chart Speed........................................................................................60

ColorLine.........................................................................................61

Depth Cursor......................................................................................62

Depth Range - Automatic..................................................................63

Depth Range - Manual ......................................................................64

FasTrack .........................................................................................65

Fish I.D. (Fish Symbols & Depths)................................................65

To turn the Fish I.D. feature on....................................................67

FishTrack........................................................................................67

To turn on FishTrack.....................................................................67

Frequency (Change Transducer Frequency) (SeaFinder only)........68

To change the frequency setting to 50 kHz ..................................69

To change the frequency setting to 200 kHz ................................69

HyperScroll.....................................................................................69

Noise Rejection...................................................................................69

Overlay Data......................................................................................69

Ping Speed & HyperScroll ..............................................................72

To change Ping Speed....................................................................73

To adjust Sensitivity......................................................................73

iii

To turn off HyperScroll..................................................................74

Pop-up Help........................................................................................74

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

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

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

Sensitivity & Auto Sensitivity...........................................................78

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

To turn Auto Sensitivity back on..................................................79

Set Language .....................................................................................80

Software Version Information...........................................................80

Sonar Chart Mode..............................................................................80

To change the chart mode color scheme .......................................81

Sonar Page & Sonar Chart Display Options....................................81

Full Sonar Chart............................................................................81

Split Zoom Sonar Chart.................................................................82

Digital Data/Chart.........................................................................83

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

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

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

To adjust the Surface Clarity level...............................................87

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

To adjust Menu Transparency level..............................................89

Units of Measure................................................................................89

Zoom & Zoom Bar..............................................................................90

Zoom Pan............................................................................................91

Section 5: Troubleshooting..........................................................92

Unit won't turn on..........................................................................93

Unit operates only in demo mode..................................................93

Unit freezes, locks up, or operates erratically..............................93

Weak bottom echo, digital readings erratic, or no fish signals....94

No fish arches when the Fish I.D. feature is off:.........................95

Noise...............................................................................................95

Section 6: Supplemental Material..............................................97

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! We know you're anxious

to begin finding fish, but we have a favor to ask. Before you grab your

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 com-

pact, wide-screen, fish finder.

First, we want to thank you for buying an Eagle sonar. 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 sonar tasks. You

won't find another sonar unit with this much power and this many fea-

tures 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 6 sections. This first section is an intro-

duction to the sonar unit. It tells you the basics you need to know before

you can make the unit look below the surface to find some fish.

Section 2 will help you install your unit and the transducer. 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 45 and head

for the water with your sonar unit!)

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

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

Other Features.

When you come to a sonar menu command you can look it up in the man-

ual 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.

Finally, in Section 6, we offer Supplemental Material, including a list of

warranty and customer service information.

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

fications to see just how much sonar power your unit contains. It's impor-

tant to us (and our power users), but, if you don't care how many watts of

power the unit has, skip ahead to important information on how sonar

works, on page 4.

Capabilities and Specifications: FishMark® 640c,

SeaFinder® 640c DF General

Display:............................5.0" (12.7 cm) diagonal 256-color TFT LCD;

programmable to viewing preference.

Resolution:......................640V x 480H pixel resolution; 307,200 total

pixels

Backlighting:..................Backlit screen and keypad with multiple

lighting levels for night use.

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

saltwater use.

Back-up memory:..........Built-in memory stores sonar settings for

decades.

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

Sonar

Frequency:......................50/200 kHz for SeaFinder 640c DF; 200

kHz for FishMark 640c.

Transducers:..................A dual-frequency Skimmer transducer with

built-in temperature sensor is packed with

the /12SeaFinder 640c DF. It has 35° ° cone

angles. A single-frequency Skimmer trans-

ducer with built-in temperature sensor is

packed with the FishMark 640c. It has a

20° cone angle. Transducers operate at

speeds up to 70 mph (61 kts)

Watts:............................... SeaFinder 640c DF: 4,000 watts peak-to-

peak/500 watts RMS. FishMark 640c: 1,500

watts peak-to-peak/100 watts RMS.

Sonar sounding

Depth capability:...........SeaFinder 640c DF: 1,500 feet (457 me-

ters). FishMark 640c: 800 feet (244 meters).

Actual capability depends on transducer con-

figuration and installation, bottom composi-

tion and water conditions. 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.

Speed/distance log:.......Optional (requires optional speed sensor).

NOTICE!

The storage temperature range for your unit is from -4 degrees to

+167 degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Ex-

tended storage 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. The phone numbers are

listed on the last page.

How Sonar Works

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

works, skip ahead to the next segment on the typographical conventions

used in this manual. But, if you have never owned a sonar fish finder,

this segment will explain the under water basics.

Sonar is an abbreviation for SOund NAvigation and Ranging, a tech-

nology developed during World War II for tracking enemy submarines.

A sonar consists of a transmitter, transducer, receiver and display. In

simple terms, here's how it finds the bottom and the fish:

The transmitter emits an electrical impulse which the transducer con-

verts into a sound wave and sends into the water. The sound frequency

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

(fish, structure, bottom) and bounces back to the transducer which con-

verts 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.

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 a horizontal line depth cursor on the sonar

screen. The arrow keys also help you move around the menus so you

can execute different commands. They are represented by symbols like

these, which denote the down arrow 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: D CEPTH URSOR. 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 data type.

Instructions = Menu Sequences

Most functions you perform with the sonar unit are described as a se-

quence of key strokes and selecting menu commands. We've written

them in a condensed manner for quick and easy reading.

For example, instructions for turning on the Fish ID feature would

look like this:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press →

→

→→ or →

→

→→ ↓

↓

↓↓ to FISH ID SYMBOLS|ENT|EXIT|EXIT.

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

the Sonar Page. Press the Menu key then repeatedly press (or press and

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

the Sonar Features menu command. Then press the Enter key."

Step 2 would mean: "Press the right arrow key (for dual-frequency

units) or press the right arrow key followed by the down arrow key (for

single-frequency units) to select (highlight) the Fish ID symbols com-

mand. Next, press the Enter key, then press the Exit key twice."

Section 2: Installation & Accessories

Preparations

You can install the sonar system 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 vessel!

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

plan how and where to route the cables for the transducer and power.

This will help you make sure you have enough cable length for the de-

sired configuration.

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 sonar

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 sonar

unit on the bracket.

Transducer Installation

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

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

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

instructions before proceeding with any installation.

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

prevent damage if the transducer strikes an object while the boat is

moving. If the transducer does "kick-up" the bracket can easily be

pushed back into place without tools.

Read these instructions carefully before attempting the installation.

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

Remember, the transducer location and installation is the most

critical part of a sonar installation.

Recommended Tools and Supplies

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

will need a 5/8" drill bit. If you intend to install an additional speed or

temp sensor and route its cable through the same hole in the transom,

you will need a 1" (25.4 mm) drill bit to accommodate all the cables.

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

screwdriver. Supplies: none.

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.

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 portion of the back cover). A

sandwich hull also requires polyester resin.

Selecting a Transducer Location

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

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

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

water, interference caused by bubbles and turbulence will show on the

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

moving.

NOTE:

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

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

typically have large outboard motors capable of propelling the boat

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

aluminum boats is between the ribs closest to the engine.

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

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

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

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

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

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

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

terfere 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.

Deadrise less than 10

°°

Pad Strakes

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

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

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

ducer cable around these wires.

Good and poor transducer locations.

How low should you go?

For most situations, you should install your Skimmer transducer so

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

usually give you the best combination of smooth water flow and protec-

tion from bangs and bumps.

Align transducer centerline with hull bottom. A dual frequency trans-

ducer is shown at left and a single frequency transducer at right.

CAUTION: Clamp the trans-

ducer cable to transom near

the transducer. This will help

prevent the transducer from

entering the boat if it is

knocked off at high speed. Good location

Good location

Poor angle

Poor location

Good

loc

tion

Transom

Tra

som

Hull bottom

Transducer

centerline

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

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

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

quently lose bottom signal lock while running at high speed the trans-

ducer may be coming out of the water as you cross waves or wakes.

Move the transducer a little lower to help prevent this.

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

may be frequently kicking up from object strikes. If you 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 installa-

tion (often called "thru-hull"). In that case, a hole is cut in the hull and

a specially designed transducer is mounted through the hull with a

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

the water.

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

tion and good to excellent depth capability. There is no possibility of

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

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

knocked off when docking or loading on a trailer.

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.

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 instruction booklet to determine if you can

satisfactorily shoot through the hull.

Transom Transducer Assembly and Mounting

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

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

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

The following instructions sometimes vary depending on the mounting

bracket that came with your transducer. Single frequency Skimmers

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

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

of instructions that fits your model.

1. Assembling the bracket.

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

of the metal bracket as shown in the following illustration. Notice there are

letters molded into each ratchet. Place each ratchet into the bracket with

the letter "A" aligned with the dot stamped into the metal bracket. This po-

sition sets the transducer's coarse angle adjustment for a 14° transom. Most

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

Align plastic ratchets in bracket.

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

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

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

ing illustrations. Notice there are letters molded into each ratchet. Place

the ratchets into the bracket with the letter "A" aligned with the align-

ment mark molded into the bracket. Place the ratchets onto the trans-

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

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

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

have a 14° angle.

Insert and align ratchets.

Dot

Alignment letters

Alignment

positions

Transducer

Trans

ducer

bracket

Add ratchets to bracket and transducer.

2. Aligning the transducer on the transom.

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

ets. Temporarily slide the bolt though the transducer assembly and

hold it against the transom. Looking at the transducer from the side,

check to see if it will adjust so that its face is parallel to the ground.

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

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

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

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

in the bracket.

Reassemble the transducer and bracket and place them against the

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

allel 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.

Transducer bracket

Ratchet Ratchet

Transducer

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 posi-

tion on the transducer stem.

Reassemble the transducer and bracket and place them against the

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

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

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

place the transducer on the transom correctly.

Ratchets

Assemble transducer and bracket.

3. Assembling the transducer.

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

ratchets, assemble the transducer as shown in the following figure.

Don't tighten the lock nut at this time.

Assemble transducer and bracket.

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

ratchets, assemble the transducer as shown in the figure in step 2B.

Don't tighten the lock nut at this time.

4. Drilling mounting holes.

Hold the transducer and bracket assembly against the transom. The

transducer should be roughly parallel to the ground. The trans-

ducer's centerline should be in line with the bottom of the hull. Don't

let the bracket extend below the hull!

Nut

Metal

washer

Metal washer

Bolt

Rubber

washers

Flat washer

Lock washer

Flat washer

Nut

Bolt

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

will drill one hole in the center of each slot.

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

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

screws).

Position transducer mount on transom and mark mounting holes.

Side view shown at left and seen from above at right.

5. Attaching transducer to transom.

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

assemble it with the cable passing through the bracket over the bolt as

shown in the following figures.

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

bracket. Side view shown at left and seen from above at right.

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

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

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

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

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

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

Transom

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

strikes an object in the water.

Align transducer centerline with hull bottom and attach transducer to

transom. Rear view of dual-frequency Skimmer shown.

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

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

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

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

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

when routing the transducer cable around these wires.

WARNING:

Clamp the transducer cable to the transom close to the

transducer. This can prevent the transducer from enter-

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

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

the required hole size will be 5/8".

Flat-bottom hull

Deep-"vee" hull

Bottom

hull

Caution:

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

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

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

ant used for the mounting screws.

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

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

bracket down. This puts the transducer deeper into the water, hope-

fully below the turbulence causing the noise. Don't allow the transducer

bracket to go below the bottom of the hull!

Trolling Motor Bracket Installation

(single-frequency only)

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

following figure, using the hardware supplied with the transducer.

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

Attach motor mounting bracket to transducer.

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

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

tion the transducer to aim straight down when the motor is in the wa-

ter. Tighten the strap securely.

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

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

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

to turn freely. Route the cable to the sonar unit and the transducer is

ready for use.

TMB-S bracket

Bolt Internal tooth washer

Nut

Flat washer

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 Flotation Materials

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

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

ers. The sonar signal must pass through solid fiberglass. A successful

transducer installation can be made on hulls with flotation materials

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

the material is removed from the chosen area. See the figure below.

WARNING:

Do not remove any material from your inner hull unless

you know the hull's composition. Careless grinding or

cutting on your hull can result in damage that could

sink your boat. Contact your boat dealer or manufac-

turer to confirm your hull specifications.

Epoxy the transducer to a solid portion of the hull.

Fill with resin

Inner hull

Epoxy to hull first Outer hull

Flotation material

Fill with resin

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. Re-

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

outer layer of fiberglass. The transducer can then be epoxied directly to

the outer layer of fiberglass. After the epoxy cures for 24 hours, fill the

remaining space with polyester resin. When the job is finished, the hull

is watertight and structurally sound. Remember, the sonar signal must

pass through solid fiberglass. Any air bubbles in the fiberglass or the ep-

oxy will reduce or eliminate the sonar signals.

Testing Determines Best Location

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

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

performance during high speed maneuvers.

Shoot-thru-hull transducer locations for

high speed or trolling speed operation.

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

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

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

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

hold the transducer over the side of the boat in the water. Adjust the sen-

sitivity and range controls until a second bottom echo is seen on the dis-

play. You'll need to turn off Auto Sensitivity, Auto Depth Range and

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

Transducer location

(trolling speed)

Transducer location

(high speed)

harder (more rocky) the bottom, the easier it will be to get a second bot-

tom signal. Don't touch the controls once they've been set.

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

range set at 80 feet and sensitivity set at 87 percent

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

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

figure on page 25.) Notice how the signal strength decreases. The sec-

ond bottom signal will probably disappear and the bottom signal inten-

sity will likely decrease.

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

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

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

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

by three or five keystrokes and then move the transducer around once

more. If you find a spot that works, mark it and move on to step 4.

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

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

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

up to get a decent bottom signal.

Second bottom

True bottom

Manual range setting

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

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

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

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

some way to prop the transducer into position while you make your test

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

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

installation.

Shoot-Thru-Hull Installation

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

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

terials" beginning on page 22.

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

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

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

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

the entire transducer face is in contact with the hull prior to bonding.

After sanding, clean the hull and transducer with rubbing alcohol to

remove any sanding debris.

Epoxy transducer to hull.

WARNING:

Use only the epoxy available from LEI. It has been for-

mulated to work with these installation procedures.

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

right consistency for optimum transducer performance.

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

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

Thoroughly stir the two compounds together until the mixture has a

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

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

stallation before the epoxy becomes unworkable.

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

the transducer as shown in the previous figure. Make sure there are no

air pockets in the epoxy layer! Then, apply the remaining epoxy to the

sanded area on the hull.

Spread epoxy here

Sand this surface

(unit's face)

Orient the Skimmer

with the nose facing

the bow of the boat.

To bow

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

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

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

ducer should be parallel with the hull, with a minimum amount of ep-

oxy between the hull and transducer.

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

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

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

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

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

ready to use.

Speed/Temperature Sensors

This unit can accept as many as two temperature sensors, which can be

used to monitor the temperature of surface water, a live well or some

other location. These units can also accept an optional speed sensor for

showing speed and distance traveled. However, you can only use one ac-

cessory at a time. If you would like to use a speed sensor and a second

temperature sensor at the same time, you will need a combination device.

NOTE:

This unit is packed with a transducer containing a built-in temp sensor.

The SeaFinder package also includes a speed sensor. If you have a

FishMark and want a speed sensor or additional temp sensor, see the

Accessory Ordering Information in the back of this manual.

If a temp sensor is used, it must be the model TS-2U. Thissecond

model has a fixed electronic "address" which designates it as the second

of two temp sensors. Dual temperatures are only displayed on the Full

Chart page. The Large Digital page will only display the primary tem-

perature sensor. See the following wiring diagram for temperature and

speed sensor combinations.

Sonar unit with external temp sensor, external speed sensor, or combo

speed/temp sensor. The primary temperature sensor is built

into the transducer.

Optional Speed Sensor Installation

All the units in this series can display speed and distance traveled, but

only the SeaFinder 640c DF comes packed with a speed sensor. If you

wish to purchase an optional additional sensor for your unit, refer to

the accessory ordering information inside the back cover of this man-

ual. The following instructions describe how to install the speed sensor.

Speed sensor or

combo speed/

temp sensor.

Sonar unit rear view

Temp

sensor

Temp sensor built

into transducer.

Power/transducer

cable

3-amp fuse

Power/transducer socket

Accessory

socket

Recommended tools for this job include: drill, 5/8" drill bit, 1/8" drill bit for

pilot holes, screwdriver. Required supplies for this job include: four #8

stainless steel wood screws (3/4" long), high quality, marine grade above-

or below-waterline caulking compound.

First find a location on the boat's transom where the water flow is smooth-

est. Don't mount the sensor behind strakes or ribs. These will disturb the

water flow to the speed sensor. Make sure the sensor will remain in the

water when the boat is on plane. Also make sure the location doesn't inter-

fere with the boat's trailer. Typically, the sensor is mounted about one foot

to the side of the transom's centerline.

Once you've determined the proper location for the unit, place the sen-

sor on the transom. The bottom of the bracket should be flush with the

hull's bottom. Using the sensor as a template, mark the hull for the

screws' pilot holes. Drill four 1/8" holes, one in each end of the slots.

Mount the sensor to the hull using #8 stainless steel wood screws (not

included). Use a high quality, marine grade above- or below-waterline

caulking compound to seal the screws. Make sure the sensor is flush

with the bottom of the hull and tighten the screws.

Stern view showing good location for mounting sensor on transom.

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

som and the sensor with the caulking compound. This will help ensure

a smooth water flow.

Good location

Speed sensor mounting configuration:

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

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

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

the required hole size is 5/8".

Caution:

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

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

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

ant used for the screws.

The sensor is now ready for use. Connect the sensor to the accessory

socket on the back of your unit. If you have any questions concerning

the installation of the sensor, please contact your local boat dealer.

Power Connections

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

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

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

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

the power cable directly to the battery.

Transom

Bottom of hull

Caution:

When using the unit in a saltwater environment, we strongly rec-

ommend that you shut off the power supply to the power cable when

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

to a power supply, electrolysis can occur in the power cable plug.

This may result in corrosion of the plug body along with the electri-

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

In saltwater environments we recommend you connect the power

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

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

available, we recommend connecting direct to the battery and in-

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

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

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

pecially when the power cable is disconnected from the unit.

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

cially the engine's wires. This will provide the best isolation from elec-

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

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

lead, black is negative or ground. Make sure to attach the in-line fuse

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

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

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

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

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

Power connections for the sonar unit.

WARNING:

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

the power cable! Failure to use a 3-amp fuse will void

your warranty. This product must be independently

fused with the enclosed 3-amp fuse (or equivalent), even

if you connect to a fused accessory or power buss. If a

malfunction happens inside the unit, extensive damage

can occur if the enclosed fuse is not used. As with all elec-

trical devices this unit could be damaged to a point that

it is unrepairable and could even cause harm to the user

when not properly fused.

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

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

wires are attached correctly.

Mounting the Unit: Bracket, In-Dash or Portable

You can install the sonar unit on the top of a dash with the supplied

gimbal bracket. It can also be installed in the dash or mounted on a

portable power supply. If you use the supplied bracket, you may be in-

terested in the optional R-A-M bracket mounting system. This con-

verts the unit's gimbal bracket to a swivel mount, which can be used on

the dash or overhead mounting positions. Installation instructions are

supplied with the R-A-M mounting kits.

12 volt

battery

Black wire Red wire with

3 amp fuse

To unit Optional power off switch for

saltwater installations

Bracket Installation

Mount the unit in any convenient location, provided there is clearance

behind the unit when it's tilted for the best viewing angle. You should

also make sure there is enough room behind the unit to attach the

power and transducer cables. A drawing on the next page shows the

dimensions of a gimbal-mounted sonar unit.

Holes in the bracket's base allow wood screw or through-bolt mounting.

You may need to place a piece of plywood on the back side of thin fiber-

glass panels to reinforce the panel and secure the mounting hardware.

Install the gimbal bracket. Orient the bracket so the arms slope toward

the front of your unit.

Drill a 1-inch (25.4 mm) hole in the dash for the power and transducer

cables. The best location for this hole is immediately under the gimbal

bracket location. This way, the bracket can be installed so that it covers

the hole, holds the cables in position and results in a neat installation.

Some customers prefer to mount the bracket to the side of the cable

hole. It's just a matter of personal preference.

After drilling the hole, pass the transducer connector up through the

hole from under the dash. Pass the power cable's bare-wire end down

though the hole from the top.

If you wish, you can fill in the hole around the cables with a good ma-

rine caulking compound. Some marine dealers stock cable hole covers to

conceal the opening. No matter what type of installation you prefer, be

Front

sure to leave enough slack in the cables to allow tilting or swiveling the

unit. If you choose to fill in the hole, be sure to position the cables

against the rear edge of the hole as you apply the fill material.

Front view (left) and side view (right) showing dimensions of the

sonar unit when mounted on gimbal bracket.

Before positioning the bracket, be sure to hold the cables against the

rear edge of the hole. Then, slide the bracket over the hole and butt the

rear of the bracket base firmly against the cables, thus pinning them in

place against the side of the hole. Finally, fasten the bracket to the

dash. Attach the unit to the gimbal bracket using the supplied gimbal

knobs and washers.

Millimeter

[Inch]

23.4

[0.92]

72.9

[2.87]

137.9

[5.43]

56.9

[2.24]

157.9

[6.22]

173.9

[6.85]

In-Dash Installation

You can mount the unit in the dash with an optional FM-5 In-Dash

Adapter Kit. The kit includes mounting hardware, a template for cut-

ting the hole and an instruction sheet, part 988-0147-43.

In-dash mounting template for the sonar unit, showing

dimensions. NOTE: The figure above is printed to scale. A scalednot

template (FM-5 In-Dash Adapter Kit instructions) is available for free

download from our web site, www.eaglesonar.com.

Portable Installation

Like many Eagle products, this sonar unit is capable of portable opera-

tion by using an optional portable power pack. The power pack and an

optional portable transducer expand the uses of your sonar unit. The

power pack makes it easy to use the unit on your boat or take it to the

dock, on a float tube, on an ice fishing trip or as a second sonar in a

friend's boat.

113.5

[4.46]

Millimeters

[Inches]

ALWAYS VERIFY D

MENSIONS

In-Dash

Template

R 7.9

[0.31]

146.5

[5.76]

Top

The portable power pack can be used with eight "D" cell alkaline bat-

teries or an optional sealed, rechargeable battery. For set-up directions,

refer to the pack's instruction sheet.

Install batteries in power pack battery adapter.

"D" cell battery

Notes

Basic Sonar Operation

This section addresses the unit's most basic sonar operations. The in-

structions presented in Sec. 3 follow a chronological order. Sec. 4, Sonar

Options & Other Features, will discuss the more advanced functions

and utilities. Material in Sec. 4 is arranged in alphabetical order.

Before you turn the sonar unit on, it's a good idea to learn about the dif-

ferent keys, the Main Menu, the four Page screens and how they all

work together. BUT, if you just can't wait to get on the water, turn to

the one-page on page 45.Quick Reference

Keyboard

The SeaFinder 640c DF sonar unit showing

full sonar chart screen display and keyboard.

1. PWR/LIGHT (Power & Light) – The PWR key turns the unit on and

off and controls the backlight level.

2. PAGES – Pressing this and the ↑

↑

↑↑ and ↓

↓

↓↓ arrow keys switches the unit

between the three different page display options. (Full Sonar Chart,

Split Zoom Sonar Chart and Digital Data.)

3. MENU – Press this key to show the menus and submenus, which

allow you to select a command or adjust a feature.

4. ARROW KEYS – These keys are used to navigate through the

menus, make menu selections, move the chart cursor and enter data.

5. ENT (Enter) – This key allows you to save data, accept values or

execute menu commands.

6. EXIT – The Exit key lets you return to the previous screen, clear

data or clear a menu.

7. ALARM –The Alarm key is a shortcut to access the various sonar

alarms. Press this key once to open the Alarms menu.

8. ZOUT – (Zoom Out) – This key lets you zoom the screen out. This

key allows you to see the entire water column from surface to bottom.

9. ZIN – (Zoom In) – This key lets you zoom the screen in. This key en-

larges fish signals and bottom detail.

Power/lights on and off

To turn on the unit, press PWR. As the unit powers up, the Full Sonar

Chart is displayed first.

To turn on the backlight, press PWR again. The unit has three backlight

levels to select from. Repeatedly pressing PWR will cycle through the

backlight settings and turn off the backlight.

Turn off the unit by pressing and holding the PWR key for 3 seconds.

Main Menu

The unit has a Main Menu which contains both function and setup op-

tion commands. The instructions in this section will deal with sonar

functions, the basic commands that make the unit show sonar signals on

the screen. This sonar unit will work fine right out of the box with the

factory default settings. But, if you want to learn about the various sonar

options, see Sec. 4, Sonar Options & Other Features.

You can access the Main Menu from any of the four Page screens by

pressing MENU MENU| . To clear the menu screen and return to the page

display, press EXIT. Remember, our text style for "MENU|MENU" means

"press the Menu key twice." See a full explanation of our instruction

text formatting on page 5, "How to use this manual…".

Main Menu.

The Main Menu commands and their functions:

Screen command changes the contrast, brightness or display mode.

Sounds command enables or disables the sound, set the volume or set

the alarm style.

Transparency command adjusts the level of transparency for dialogs.

Sonar Alarms command turns sonar alarms on or off and changes

alarm thresholds.

Units of Measure command changes the depth, speed, distance, or

temperature units.

Set Keel Offset command changes the depth offset of the keel from the

transducer.

Calibrate Water Speed command calibrates the speed measurement.

Reset Water Distance command resets the log of distance traveled

back to zero.

Transducer Type command sets the type of transducer connected to

the unit.

Sonar Simulator command scrolls simulated data on the sonar chart.

Reset Options command resets all options to factory default settings.

Popup Help command turns popup help on or off.

Set Language command chooses which language text appears in.

Software Information command shows the product name and soft-

ware version.

Pages

The unit has three Page display options, accessed by pressing the PAGES

key. The list of display options appears in the following image.

Pages Menu showing Sonar display options.

All of the display options show the sonar chart in some format. This is a

"cross-section" view of the water column beneath the boat. The chart

moves across the screen, displaying sonar signal echoes that represent

fish, structure and the bottom.

The Pages Menu allows you to switch between three chart display op-

tions: Full Sonar Chart, Split Zoom Sonar Chart and Digital Data. To

choose between the three chart display options use ↑

↑

↑↑ or ↓

↓

↓↓ to highlight

the desired option then press EXIT.

Sonar page in Split Zoom Sonar Chart display mode.

Sonar page in Digital Data display mode.

Sonar Page Menu. Most of these functions are discussed in Sec. 4.

The Sonar Page has its own menu which is used for some advanced func-

tions and for setting various options. Sonar Options and other features

are discussed in Sec. 4. To access the Sonar Page menu press MENU once.

You can customize how the Sonar Page displays its pictures and other

data in many ways. Your unit also includes several special sonar features

and options that can help you better interpret the underwater scene.

These features and options are explained in Sec. 4, but to show you how

easy this unit is to operate, the following page contains a simplified, 10-

step quick reference that will cover most fish finding situations. The

quick reference describes how the unit operates with all the sonar fea-

tures in automatic mode which are pre-set at the factory.

Sonar Page showing full sonar chart mode.

Surface clutter

Bottom signal

Fish arches

In FasTrack, fish

arches show as

horizontal bars.

Depth scale

Digital data

overlay

(depth &

temperature)

Surface signal

Basic Sonar Quick Reference

1. Mount the transducer and unit. Connect the unit to electric power

and the transducer.

2. Launch your boat.

3. To turn the unit on press and release the PWR key.

4. Head for your fishing spot. The unit should automatically display

digital depth and surface water temperature in the corner of the screen.

The auto settings will track the bottom, displaying it in the lower por-

tion of the screen. The full sonar chart will scroll from right to left,

showing you what's under the boat as you cruise across the water.

5. As you're watching the sonar returns, you can change the display by:

Zoom in to enlarge the chart for more detail: press ZIN.

Zoom out to return to full chart mode: press ZOUT.

6. If necessary, adjust sensitivity to improve chart readability. Press

MENU|ENT and the Sensitivity Menu will appear on the left of your

screen. Use ↑

↑

↑↑ and ↓

↓

↓↓ to change the setting.

Boosting sensitivity will show more information on your screen, which

may cause clutter. Reducing sensitivity will filter out some information,

but could omit important images. We recommend adjusting sensitivity

until the background is lightly "peppered" — that is, scattered dots ap-

pear, but individual objects (like fish arches or bottom structure) can be

easily picked out of the background.

7. Watch the display for the appearance of fish arches. When you see

arches, you've found fish. Stop the boat and get your lure or bait into

the water at the depth indicated on the sonar chart.

8. Gauge the fish depth by visually comparing the fish arches with the

depth scale on the right side of the screen, or get a more accurate

measure with the Depth Cursor. Press MENU|↓

↓

↓↓ to D CEPTH URSOR|ENT.

Press ↓

↓

↓↓ (or ↑

↑

↑↑) to align the cursor line with the fish arch. The exact

depth appears in a box at the right end of the cursor line. To clear the

cursor, press EXIT.

9. If you are drifting at a very low speed or anchored, you are not mov-

ing fast enough for a fish to return the tell-tale fish arch signal. As you

drift over a fish, or as a fish swims through the transducer's signal

cone, the fish echo will appear as a straight line suspended between the

surface and the bottom.

10. To turn off the unit, press and hold PWR key for three seconds.

Sonar Operations

As you can see from the quick reference, basic operation of this fish

finder is pretty easy right out of the box. If you are a sonar novice, try

operating the unit with the factory defaults until you get a feel for how

it's working.

As you are learning the basics, there is one setting you might want to

tinker with from time to time — Sensitivity.

Sensitivity controls the unit's ability to pick up echoes. If you want to

see more detail try increasing the sensitivity a little at a time. There

are situations when too much clutter appears on the screen. Decreasing

the sensitivity can reduce the clutter and show the strongest fish ech-

oes if fish are present. As you change the sensitivity setting you can see

the difference on the chart as it scrolls.

These figures show results of different sensitivity levels on the same lo-

cation. Fig. 1: Sensitivity at 88 percent, determined by Auto Sensitivity.

Typical of full auto mode. Fig. 2: Sensitivity set at 75 percent. Fig. 3: Sen-

sitivity set at 50 percent. Fig. 4: Sensitivity set at 100 percent.

You can change the sensitivity level whether you are in Auto Sensitivity

mode or Manual Sensitivity mode. The adjustment method works the

same in both modes, but it gives you slightly different results.

Fig. 1 Fig. 2

Fig. 3 Fig. 4

Adjusting sensitivity in Auto Sensitivity Mode is similar to manually

adjusting a car's speed with the accelerator pedal while cruise control is

on. You can tell the car to run faster, but when you let off the gas the

cruise control automatically keeps you from running slower than the

minimum speed setting. In the unit, auto mode will let you increase

sensitivity to 100 percent, but the unit will your setting.limit minimum

This prevents you from turning sensitivity down too low to allow auto-

matic bottom tracking. When you change the setting with auto turned

on, the unit will continue to track the bottom and make minor adjust-

ments to the sensitivity level, with a bias toward the setting you se-

lected.

Adjusting sensitivity in Manual Sensitivity Mode is similar to driving a

car without cruise control — you have complete manual control of the

car's speed. In the unit, manual mode allows you to set sensitivity at

100 percent (maximum) or zero percent (minimum.)

Depending on water conditions, the bottom signal may completely dis-

appear from the screen when you reduce sensitivity to about 50 percent

or less.

Try adjusting sensitivity in both auto and manual modes to see how

they work.

To adjust sensitivity:

1. Press MENU|ENT.

2. The Sensitivity Control Bar appears. Press ↓

↓

↓↓ to decrease sensitivity;

press ↑

↑

↑↑ to increase sensitivity. When it's set at the desired level, press

EXIT. When you reach the maximum or minimum limit, a tone sounds.

Sonar Menu (left) with Sensitivity command selected. The Sensitivity

Control Bar is shown at right.

NOTE:

If you want to change the sensitivity in Manual Mode, first turn off

Auto Sensitivity. From the Sonar Page press MENU|↓

↓

↓↓ to AUTO

S SENSITIVITY|ENT|↑

↑

↑↑ to ENSITIVITY|ENT. Press ↓

↓

↓↓ ↑

↑

↑↑ or to pick a different

sensitivity setting. When it's set at the desired level press EXIT.

Important Tip:

While you are experimenting and learning, it's possible to scramble

the settings so that the sonar picture disappears from your screen.

If that happens remember that it's easy to switch back to full auto-

matic operation by restoring the factory auto settings. Here's how:

To Restore Factory Settings

1. Press MENU| | | .MENU ↓

↓

↓↓ to R OESET PTIONS ENT

2. The unit asks if you want to reset all the options. Press ←

←

←← to

YES|ENT. All options are reset and the unit reverts back to the Full

Sonar Chart.

Fish Symbols vs. Full Sonar Chart

You may have noticed in the quick reference we used fish arches in full

sonar chart mode for our example instead of the popular Fish I.D. fish

symbol feature. Here's why.

Fish I.D. is an easier way for a sonar novice to recognize a fishy signal

return when he sees it. However, locating fish by symbol only has some

limitations.

Your sonar unit's microprocessor is remarkably powerful but it can be

fooled. Some of the echoes calculated to be fish could be tree limbs or

turtles. To see what's under your boat in maximum detail, we recom-

mend you turn off Fish I.D. and begin learning to interpret fish arches.

Fish I.D. is most handy when you're in another part of the boat or per-

forming some task that prevents you from watching the sonar screen.

Then, you can turn on Fish I.D. and the audible fish alarm. When that

lunker swims under your boat, you'll hear it!

Fish I.D. can also be useful when you want to screen out some of the

sonar detail gathered by your unit. For example, in one case a fisher-

man in San Francisco Bay saw clouds of clutter in the water but no fish

arches. When a down rigger was pulled up it brought up several small

jellyfish. The fisherman switched the sonar to Fish I.D., which screened

out the schools of jellyfish and clearly showed the game fish as fish

symbols.

Other Free Training Aids

The sonar options section discusses Fish I.D., fish alarms and other fea-

tures in greater detail. If you or a friend has Internet access, you can

also learn more about interpreting what you see on your sonar screen.

Visit our web site, WWW.EAGLESONAR.COM. Be sure to check out the

free Sonar Tutorial, which includes animated illustrations and more

pictures of actual sonar returns, all described in detail. A "printer

friendly" version of the tutorial is available on our web site. It makes a

great supplement to this manual.

For the ultimate training aid download the free emulator software for

your unit. Aside from being just plain fun, this program can help you

learn both basic and advanced operations without burning boat fuel.

Eagle is one of the first sonar manufacturers to provide this type of

training tool for customers.

The emulator software simulates the actual sonar unit on your home

computer. You can run it from your computer keyboard or use your

mouse to press the virtual keys. Easy download and installation in-

structions are available on our web site.

Notes

Section 4: Sonar Options & Other Features

Material in this section is arranged in alphabetical order.

ASP



 (Advanced Signal Processing)

The ASP feature is a noise rejection system built into the sonar unit

that constantly evaluates the effects of boat speed, water conditions

and interference. This automatic feature gives you the best display pos-

sible under most conditions.

The ASP feature is an effective tool in combating noise. In sonar terms,

noise is any undesired signal. It is caused by electrical and mechanical

sources such as bilge pumps, engine ignition systems and wiring, air

bubbles passing over the face of the transducer, even vibration from the

engine. In all cases, noise can produce unwanted marks on the display.

The ASP feature has four settings: Off, Low, Medium and High. If you

have high noise levels, try using the "High" ASP setting. However, if

you are having trouble with noise, we suggest that you take steps to

find the interference source and fix it, rather than continually using the

unit with the high ASP setting.

There are times when you may want to turn the ASP feature off. This

allows you to view all incoming echoes before they are processed by the

ASP feature.

Sonar Menu (left) with Sonar Features selected. In the Sonar

Features menu (center) the SeaFinder's Noise Rejection feature is se-

lected with ASP in the default low setting. The Noise Rejection feature

(far right) is set the same in the FishMark unit.

To change the ASP level:

1. From the Sonar Page press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press ↓

↓

↓↓ to N ROISE EJECTION|ENT.

3. Press ↓

↓

↓↓ or ↑

↑

↑↑ to select a setting then press ENT.

4. To return to the previous page press EXIT EXIT| .

Alarms

This unit has three different types of sonar alarms. The first is the Fish

Alarm. It sounds when the Fish I.D. feature determines that an echo

is a fish.

Another alarm is the Zone Alarm, which consists of a bar on the side of

the screen. Any echo on the chart that appears inside this bar triggers

this alarm.

The last alarm is the Depth Alarm, which has both a Shallow and a

Deep setting. This is useful as an anchor watch, a shallow water alert

or for navigation.

3. Press ←

←

←← to Shallow Alarm ENABLED|ENT|EXIT.

4. To turn the alarm off press ALARM|ENT|EXIT.

To switch to a different depth setting, open the Sonar Alarms menu and

repeat the instructions in step 3 above.

To adjust and turn on the Deep Alarm:

1. Press ALARM| | | | .

↓

↓↓ to Deep Alarm ENABLED →

→

→→ DEPTH ENT

2. Press ↑

↑

↑↑ or ↓

↓

↓↓ to change the first number, then press →

→

→→ to move the

cursor to the next number and repeat until the depth is correct, then

press ENT.

3. Press ←

←

←← to ENABLED|ENT|EXIT.

4. To turn the alarm off press ALARM|↓

↓

↓↓ to Deep Alarm

E EXITNABLED|ENT| .

To switch to a different depth setting open the Sonar Alarms menu and

repeat the instructions in step 3 above.

Zone Alarm

The zone alarm is triggered when any echo passes inside the zone

alarm bar, shown on the right side of the screen.

To adjust and turn on the Zone Alarm:

1. Press ALARM| | | .

↓

↓↓ to Zone Alarm ENABLED →

→

→→ to A ZDJUST ONE ENT

2. To set the upper boundary for the Zone Alarm, use ←

←

←← or to select

→

→→

U LPPER IMIT, then press ↑

↑

↑↑ ↓

↓

↓↓ or to move the top of the bar to the desired

depth.

3. To set the lower boundary for the Zone Alarm, use ←

←

←← or to select

→

→→

L LOWER IMIT, then press ↑

↑

↑↑ or ↓

↓

↓↓ to move the bottom of the bar to the desired

depth.

Sonar Alarms menu (left) with Adjust Zone command selected.

Adjust Zone Alarm selection box (right) with Upper Limit selected.

4. Press EXIT| | |

←

←← to Zone Alarm ENABLED ENT EXIT. Now, any echo —

fish, bottom, structure — within the zone alarm's depth range will trig-

ger the zone alarm.

5. To turn the alarm off press ALARM|↓

↓

↓↓ to Zone Alarm

E EXITNABLED|ENT| .

To switch to a different depth setting, open the Sonar Alarms menu and

repeat the instructions in steps 3 and 4 above.

Fish Alarm

Use the fish alarm to receive an audible alarm when fish or other sus-

pended objects are detected by the Fish I.D. feature. Fish I.D. must

be turned on for the Fish Alarm to work. A different tone sounds for

each fish symbol size shown on the display.

Sonar Alarms menu with Fish Alarm selected. The check box to the left

is blank, indicating the alarm is turned off.

To turn the Fish Alarm on:

1. Press ALARM| | .

↓

↓↓ to Fish Alarm|ENT EXIT

2. To turn off the alarm, press ALARM|↓

↓

↓↓ to Fish Alarm|ENT|EXIT.

Backlight and Contrast Level

When you turn the unit on it defaults to the maximum backlight level.

To adjust the display's backlight level select SCREEN from the Main

Menu. From the Screen menu you can adjust the Contrast and Bright-

ness levels by using the slide bars. The backlight level can also be con-

trolled by using the PWR PWR key. Pressing the key will scroll the unit

through three different lighting levels.

From the Screen menu you can also select D MISPLAY ODE. See the follow-

ing image. In Display Mode you can adjust the unit's screen settings

from either Normal, High Contrast or Night View. The Display Mode

setting you choose will probably depend on your fishing conditions.

The unit's backlight level can be controlled from the Screen menu.

Calibrate Speed

The speed sensor can be calibrated to compensate for inaccuracies. Be-

fore you change the setting, first calculate the percentage that the

speed is off. You will enter this percentage in a moment.

For example, if you figure the sensor is reading 10 percent faster than

actual speed, you will enter – 10 in the calibration window. If the sen-

sor is reading 5 percent slower than true speed, you will enter + 5 in

the window.

When you make a run to compare your ground speed to speed sensor

speed, perform your test in relatively calm water, free of current, if pos-

sible. Unless, of course, you are taking the current speed into consid-

eration when making your calculation. After you have a correction fig-

ure, here's how to enter it:

1. Press MENU MENU| |↓

↓

↓↓ to C W SALIBRATE ATER PEED|ENT.

2. Enter the number you calculated earlier and press ↑

↑

↑↑ or ↓

↓

↓↓ to change

the first character (+ or –), then press →

→

→→ to move the cursor to the next

number and repeat until the percentage is correct, then press EXIT.

Chart Speed

The rate that echoes scroll across the screen is called the chart speed.

The default is maximum. We recommend you leave the speed set at de-

fault for virtually all fishing conditions.

However, you might consider experimenting with chart speed when you

are stationary or drifting very slowly. You may sometimes achieve bet-

ter images as you slow down the chart speed to match how fast you are

moving.

If you are at anchor, ice fishing or fishing from a dock, experiment with

a chart speed around 50 percent. If you are drifting slowly, try a chart

speed around 75 percent. When you are stationary and a fish swims

through the sonar signal cone, the image appears on the screen as a

long line instead of a fish arch. Reducing the chart speed may result in

a shorter line that more closely resembles a regular fish return.

Sonar Page menu (left) with Chart Speed command selected.

The Chart Speed control bar is shown at right.

If you experiment with chart speed remember to reset it to maximum

when you resume trolling or moving across the water at higher speeds.

To change chart speed:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to C SHART PEED|ENT.

2. The Chart Speed Control Bar appears. Press ↓

↓

↓↓ to decrease chart

speed or press ↑

↑

↑↑ to increase chart speed.

3. When it's set at the desired level, press EXIT.

ColorLine

ColorLine lets you distinguish between strong and weak echoes. It

"paints" a brighter color on targets that are stronger than a preset

value. This allows you to tell the difference between a hard and soft

bottom. For example, a soft, muddy or weedy bottom returns a weaker

signal which is shown with a narrow, colored line (dark blue tinged

with red or a little yellow.) Since fish are among the weakest echoes,

they show up mostly as blue arches. A hard bottom or other relatively

hard target returns a strong signal which causes a wider brightly col-

ored line (reddish yellow to bright yellow.)

If you have two signals of equal size, one with red to yellow color and

the other without, then the target with brighter color (yellow) is the

stronger signal. This helps distinguish weeds from trees on the bottom,

or fish from structure.

ColorLine is adjustable. Experiment with your unit to find the

ColorLine setting that's best for you. To adjust the ColorLine

level:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to COLORLINE|ENT.

2. The ColorLine Control Bar appears. Press ↓

↓

↓↓ to decrease ColorLine;

press ↑

↑

↑↑ to increase Colorline.

3. When it's set at the desired level, press EXIT.

Sonar Page menu (left) with ColorLine command selected.

The ColorLine control bar is shown at right.

Little ColorLine (left) indicates a soft bottom, probably sand or mud.

The wider ColorLine (right) indicates a harder, rocky bottom.

Depth Cursor

The depth cursor consists of a horizontal line with a digital depth box on

the right side. The numbers inside the box show the depth of the cursor.

Wider

ColorLine

Thin or no ColorLine

Sonar Page menu (left) with Depth Cursor command selected. Sonar

chart (right) with the depth cursor active. The school of fish is 31.91

feet deep.

The cursor can be moved to any location on the screen, letting you pin-

point the depth of a target.

1. From the Sonar Page, press MENU|↓

↓

↓↓ to D CEPTH URSOR|ENT.

2. The depth cursor appears. Press ↓

↓

↓↓ to lower the cursor line; press ↑

↑

↑↑ to

raise the cursor line.

3. To clear the depth cursor, press EXIT.

Depth Range - Automatic

When turned on for the first time, the bottom signal is automatically

placed in the lower half of the screen. This is called Auto Ranging and

is part of the units automatic function. However, depending upon the

bottom depth and the current range, you can change the range to a dif-

ferent depth. To do this:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to D REPTH ANGE|ENT.

Cursor line

Depth box

Sonar Page menu (left) with Depth Range command selected. The

Depth Range control scale is shown at right.

2. The Depth Range control scale appears. Press ↑

↑

↑↑ or ↓

↓

↓↓ to select a dif-

ferent depth range. A blue bar highlights the selected range. The

lighter numbers cannot be selected.

3. When the new range is selected, press EXIT to clear the menu.

Depth Range - Manual

You have complete control over the range when the unit is in the man-

ual mode. There are 16 depth ranges, from 5 feet to 4,000 feet.

To switch to Manual Depth Range:

1. First, turn off automatic depth range. From the Sonar Page, press

MENU|↓

↓

↓↓ to A D RUTO EPTH ANGE|ENT.

2. Press ↑

↑

↑↑ to D REPTH ANGE|ENT and the Depth Range control scale appears.

3. Press ↓

↓

↓↓ or ↑

↑

↑↑ to select a different depth range. A horizontal black bar

highlights the selected range.

4. When the new range is selected, press EXIT to clear the menu.

To turn Auto Depth Range on again:

From the Sonar Page, press | | | .MENU ↓

↓

↓↓ to A D RUTO EPTH ANGE ENT EXIT

NOTE:

The sonar's depth capability depends on the transducer installa-

tion, water and bottom conditions and other factors.

FasTrack





This feature automatically converts all echoes to short horizontal lines

on the display's far right side. The graph on the rest of the screen con-

tinues to operate normally. FasTrack gives you a rapid update of condi-

tions directly under the boat. This makes it useful for ice fishing or

when you're fishing at anchor. When the boat is not moving, fish sig-

nals are long, drawn out lines on a normal chart display. FasTrack con-

verts the graph to a vertical bar graph that, with practice, makes a use-

ful addition to fishing at a stationary location.

Sonar Page showing FasTrack.

Fish I.D.



 (Fish Symbols & Depths)

The Fish I.D. feature identifies targets that meet certain conditions as

fish. The microcomputer analyzes all echoes and eliminates surface

clutter, thermoclines and other signals that are undesirable. In most

instances remaining targets are fish. The Fish I.D. feature displays fish

symbols on the screen in place of the actual fish echoes.

Structure

Bottom signal

Fish arches

In FasTrack, fish

arches show as

horizontal bars.

FasTrack

bar graph

ColorLine

Surface clutter

There are several fish symbol sizes. These are used to designate the

relative size between targets. In other words, Fish I.D. displays a small

fish symbol when it thinks a target is a small fish, a medium fish sym-

bol on a larger target and so on.

The sonar's microcomputer is sophisticated, but it can be fooled. It can't

distinguish between fish and other suspended objects such as trotlines,

turtles, submerged floats, air bubbles, etc. Individual tree limbs ex-

tending outwards from a group of limbs is the hardest object for the

Fish I.D. feature to distinguish from fish.

You may see fish symbols on the screen when actually, there are no

fish. The reverse is also true. The illustrations on the next page show

how Fish I.D. can be turned on. Does that mean Fish I.D. is broken?

No, the feature is interpreting sonar returns in a specific way to help

take some of the work out of reading the screen. Remember, Fish I.D. is

one of the many tools we provide so you can analyze your sonar returns

for maximum fish finding information.

This and other features can help you successfully "see" beneath the

boat under various water and fishing conditions. So, practice with the

unit in both the Fish I.D. mode and without to become more familiar

with the feature. The default for Fish I.D. is off.

Sonar Features menu with Fish I.D. Symbols selected (at left, dual-

frequency menu; at right, single-frequency menu). When the check box

to the right is checked the feature is on.

To turn the Fish I.D. feature on:

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press →

→

→→ to F SISH YMBOLS|ENT|EXIT|EXIT.

To turn off Fish I.D., repeat the instructions in step 2.

FishTrack





The FishTrack feature shows the depth of a fish symbol when it ap-

pears on the display. This lets you accurately gauge the depth of tar-

gets. This feature is available only when the Fish I.D. feature is on. The

default setting for FishTrack is off.

To turn on FishTrack:

(Note: These instructions will turn on FishTrack and Fish I.D. at the

same time.)

1. From the Sonar Page, press MENU|↓

↓

↓↓ to S FONAR EATURES|ENT.

2. Press →

→

→→ to F DISH EPTHS|ENT|EXIT|EXIT.

To turn off FishTrack, repeat the instructions in step 1. Turning off

FishTrack in this manner will not turn off Fish I.D. symbols.

Sonar Page showing both the Fish I.D. symbol and FishTrack depth fea-

tures turned on.

Fish Symbols with

FishTrack depths

Specyfikacje produktu

Marka:	Eagle
Kategoria:	Echosondy
Model:	FishMark 640C

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