Garmin Fishfinder 100 Blue User Manual

Fishfi nder 100 Blue

owner’s
manual

© 2001 GARMIN Corporation

GARMIN International, Inc.
1200 East 151st Street, Olathe, Kansas 66062, U.S.A.
Tel. [phone] or 800/800.1020
Fax [phone]

GARMIN (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.
Tel. [phone]
Fax [phone]

GARMIN Corporation
No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan
Tel. [phone]
Fax [phone]

All rights reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated,
downloaded or stored in any storage medium, for any purpose without prior written consent of GARMIN Corporation. GARMIN Corporation
hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed for
personal use, provided that such electronic or printed copy of this manual contains the complete text of this copyright notice and provided
further that any unauthorized commercial distribution of this manual is strictly prohibited.

Information in this manual is subject to change without notice. GARMIN Corporation reserves the right to change or improve its products
and to make changes in the content without obligation to notify any person or organization of such changes. Visit the GARMIN web site
(www.garmin.com) for current updates and supplemental information concerning the use and operation of this and other GARMIN products.

GARMIN, DCG, and See-Thru are registered trademarks and Fishfi nder 160 Blue is a trademark of GARMIN Corporation and may not be used
without the express permission of GARMIN Corporation.

April 2001 Part Number 190-00198-00 Rev. A Printed in Taiwan

Thank you for choosing the GARMIN Fishfi nder 100 Blue™. This
product is designed for easy operation and to provide years of reliable
service.

Please take the time to read this Owner’s Manual, and learn the opera-
tion of your new unit. This will help ensure that you get the most from
the Fishfi nder 100 Blue.

If you encounter a problem, or just have a question, contact
our Product Support Department at 913-397-8200 or 800-800-1020,
Monday — Friday 8:00 a.m. to 5:00 p.m. Central Time.

Enjoy your new Fishfi nder 100 Blue and once again thank you for
choosing GARMIN.

Introduction

Customer Service

Product Registration

Help us better support you by completing our
on-line registration today! Have the serial number
of your Fishfi nder 100 Blue handy and connect
to our web site (www.garmin.com). Look for the
Product Registration link on the Home page.

Why should you register your Fishfi nder 100
Blue?

• Notifi cation of product updates

• Notifi cation of new products

• Lost or stolen unit tracking

i

Introduction

Limited Warranty

I

All of the Fishfi nder 100 Blue screens shown
throughout this manual are simulated. These
screens are meant to provide the user with a general
knowledge of how the unit functions, and may not
refl ect what will actually be seen on the unit when
in operation.

ii

GARMIN Corporation warrants this product to be free from defects in materials
and manufacture for one year from the date of purchase. GARMIN will, at its sole
option, repair or replace any components that fail in normal use. Such repairs or
replacement will be made at no charge to the customer for parts or labor. The
customer is, however, responsible for any transportation costs. This warranty does
not cover failures due to abuse, misuse, accident or unauthorized alteration or

repairs.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE
AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR
STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE,
STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL

RIGHTS, WHICH MAY VARY FROM STATE TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL,
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING
FROM THE USE, MISUSE, OR INABILITY TO USE THIS PRODUCT OR
FROM DEFECTS IN THE PRODUCT. SOME STATES DO NOT ALLOW THE
EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE

ABOVE LIMITATIONS MAY NOT APPLY TO YOU.

To obtain warranty service, call the GARMIN Customer Service department
(913-397-8200 or 800-800-1020) for a returned merchandise tracking number.
The unit should be securely packaged with the tracking number clearly marked
on the outside of the package and sent freight prepaid and insured to a GARMIN
warranty service station. A copy of the original sales receipt is required as the proof
of purchase for warranty repairs. GARMIN retains the exclusive right to repair or
replace the unit or software or offer a full refund of the purchase price at its sole
discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY
FOR ANY BREACH OF WARRANTY.

The Fishfi nder 100 Blue Standard Package Includes:

• Fishfi nder 100 Blue

• Surface Mount Bracket with Knobs

• Power/Data Cable

• Owner’s Manual

• Dual Frequency Transom Mount Transducer (with depth/temp)*

Optional Dual Frequency Transducers and Accessories:

Plastic Transom Mount Transducer (with depth/temp)*
Bronze Thru-Hull Transducer (depth only)
Plastic Thru-Hull Transducer (depth only)
Speed Sensor*
Temperature Sensor
Protective Front Cover
10’ Transducer Extension Cable
20’ Transducer Extension Cable
Second Mounting Station
Flush Mounting Kit
Swivel Mount, 1” RAM
Cigarette Lighter Adapter
Power/Data Cable
18-Pin A/C PC Adapter (US)
18-Pin A/C PC Adapter (EURO)

* Included with Optional Package

Introduction

Packaging and Accessories

iii

Introduction

Table of Contents

Introduction..........................................................i-vi

Customer Service ..................................................................... i

Limited Warranty .................................................................... ii

Packaging and Accessories...................................................... iii

Unit Display ........................................................................... vi

Installation ...........................................................1-9

Transducers............................................................................. 1

Transom Mount Installation ................................................... 2

In-hull Installation .................................................................. 3

Speed Sensor Installation......................................................... 4

Wiring Harness Installation ..................................................... 5

Wiring to a Fuse Block ............................................................ 5

Display Installation (Surface Mount) .......................................7

Display Installation (Flush Mount) .......................................... 8

Testing the Installation ............................................................9

Unit Operation...................................................10-29

Keypad Functions ..................................................................10

Display Information ...............................................................11

Using the Adjustment Bar:

Range ..................................................................................... 12

Zoom .....................................................................................13

View....................................................................................... 13

Gain ....................................................................................... 14

Setup Menu:

Chart Tab

Frequency .............................................................................. 15

Fish Symbols.......................................................................... 16

Whiteline ...............................................................................17

Scroll Speed ...........................................................................17

Scale....................................................................................... 18

Tools Tab

Flasher ...................................................................................19

Simulator ...............................................................................19

Noise Reject ...........................................................................19

Numbers Tab

Number Size ..........................................................................20

Battery Voltage........................................................................ 21

Temperature........................................................................... 21

Speed ..................................................................................... 22

Depth Number ....................................................................... 22

iv

Alarm Tab

Fish Alarm ............................................................................23

Shallow Water ........................................................................24

Deep Water ............................................................................24

Battery Voltage .......................................................................25

System Tab

Contrast .................................................................................25

Beeper ....................................................................................26

NMEA Output........................................................................26

Language................................................................................26

Calibrations Tab

Keel Offset..............................................................................27

Water Type .............................................................................27

Calibrate Speed ......................................................................27

Units Tab

Depth ...................................................................................28

Temperature...........................................................................28

Speed .....................................................................................28

Memory Tab

Remember..............................................................................29

Factory Setup .........................................................................29

Software Version.....................................................................29

Introduction

Table of Contents

On the Water ....................................................30-35

Understanding Sonar..............................................................30

Transducer Coverage ..............................................................31

Understanding the Chart........................................................32

Whiteline ...............................................................................33

Thermoclines .........................................................................34

Simulator Mode......................................................................35

Appendix A: Specifi cations.................................... 36

Appendix B: Alarm Messages and Icons................ 37

Appendix C: Index ............................................38-40

v

Introduction

What can the Fishfi nder 100 Blue

Display?

ENTER

SETUP

vi

The Fishfi nder 100 Blue is capable of displaying a variety of useful
information about the underwater environment. Below are a few things
the unit will help you see.

Water Depth

The unit displays water depth and can provide a warning for shallow
or deep-water conditions.

Battery Voltage

The unit can display the battery voltage that is available to the unit.

Speed Over Water*

If equipped with a capable transducer or speed sensor, the unit can
display the boat’s speed over water.

Water Temperature*

If equipped with a capable transducer or temperature sensor, the unit
can display the water temperature.

Fish

The unit displays fi sh as arches or fi sh symbols, and can alert you when
a fi sh is detected.

Thermocline and Structure

With GARMIN’s See-Thru® technology, the Fishfi nder 100 Blue can
display more than just the thermocline and structure. The unit displays
fi sh in and below the thermocline, trees, brush and deadfall like you
have never seen before!

Bottom Shape and Type

Garmin’s unique DCG® (Depth Control Gain) system provides a clear
graphic representation of the bottom type and its shape.

Transducer Frequency*

If equipped with a capable transducer, the unit will display the fre­quency selected for use; either 200kHz, 50kHz or Dual.

* Requires optional transducer or speed sensor

Transducers

The transducer acts as the eyes and ears of your new sonar. Proper
transducer selection and installation are critical to the operation of your
unit.

Installation

Included in the Optional Package is a 200/50kHz frequency (10°/40°
cone angle), depth and temperature sensing, transom mount transducer.
This transducer provides good all-around performance. Other optional
dual frequency transducers are available from your local dealer or GARMIN.

The transducer transmits sound waves toward the bottom in a cone
shape. The wider the cone angle, the larger the coverage area at a given
depth. While it is good to see as large of an area as possible, it is best to
select a frequency setting that suits the water that you are on.

With a dual frequency transducer, you may select either a 200kHz
frequency, a 50kHz frequency or both. The 50kHz frequency setting
provides a wide cone angle. This wide cone angle produces a large coverage
area, but less detailed bottom resolution. In areas where bottom contours
change quickly, this can result in “dead zones” where fish cannot be seen.

In contrast, the 200kHz frequency setting provides a narrow cone
angle. This narrow cone angle produces a smaller viewing area (compared
to a wide cone angle at the same depth), but with improved bottom
resolution and a smaller dead zone.

The Dual frequency setting will provide you the most accurate depth
and fish returns by transmitting signals at both 200kHz and 50kHz.

Transducers

wide cone

angle

narrow cone

angle

dead zone

fish not seen

X

X

1

Installation

Mounting the Transducer

DO NOT mount the transducer behind strakes,
struts, fi ttings, water intake or discharge ports, or
anything that creates air bubbles or causes the
water to become turbulent. It is important that
the transducer be in calm, non-turbulent water for
optimal performance.

Proper transducer installation is key to getting the best performance
from your new unit. If the transducer lead is too short, extension cables
are available from you GARMIN dealer. DO NOT cut the transducer lead
or any part of the transducer cable, as this will void your warranty. The
cable cannot be spliced and connected to any existing (GARMIN or non­GARMIN) transducer cables.

Following are some tips and basic installation instructions for the
optional dual frequency transducer and speed sensor. Detailed installation
instructions are provided in the transducer kits.

Transom Mount Installation

Dual Frequency Transom Mount Transducer (with depth/temp).

Apply marine sealant to all
screw threads to prevent water
from seeping into the transom.

Transducer should extend 1/8" below
fiberglass hull or 3/8" below aluminum hull

OK

Mount the transducer parallel with the bottom.

Mount the transducer cable cover
well above the waterline.

Make sure that the transducer is
below water level when the boat
is on plane at high speed

Do not mount transducer directly in the
path of the prop. The transducer can cause
cavitation that may degrade the boat's performance
and damage the prop.

2

In-Hull Installation

To avoid drilling a hole to mount a thru-hull transducer, a transom
mount transducer may be used with epoxy inside a boat (also called “shoot-
thru-hull” installation). For a transducer to be mounted inside the hull
(shoot-thru, not thru-hull), the boat must be fi berglass, no core (contact
your boat manufacturer if you are unsure). Test by placing a small amount
of water inside the hull, placing the transducer on top of the water, then
verifying the accuracy of the locators versus the current water depth. If
they are the same, use epoxy (non-silicone based) to affi x the transducer
to the inside of the hull. If using a temperature sensing transducer, the
temperature displayed will reflect the hull temperature.

Selecting a Location

The location has to be solid fi berglass, devoid of any air bubbles,

laminates, fi llers or dead air space. The location needs to be in an
area of clean water at all speeds. Do not place the transducer over
any strakes or behind any obstruction on the hull that would create
turbulence.

Testing the Location

Place the transducer in the water, pointed directly at the bottom, and
set the unit for optimum performance. Place the transducer in the test
device as show on the side bar. If the sonar performance is signifi cantly
degraded, another location will need to be tested.

Installation

Mounting the Transducer

Many modern hulls have a prelocated pocket for
In-hull transducer installation. If you are unsure
if your hull is equipped with a prelocated pocket,
contact your hull manufacturer.

Weight
transducer to
hold it in place

Fill Pipe or Can
with water or a
light mineral oil

Strip Caulk or
RTV Sealer

PVC Pipe
or a Can

Continued on page 4

Hull Surface

Testing the Location

3

Installation

Mounting the Transducer/

Speed Sensor

Apply twisting motion

to eliminate any

trapped air bubbles

Weight transducer in place
for at least 24 hours

Installing the Transducer

Slow cure

2-part epoxy

Strip Caulk or
RTV Sealer

In-Hull Installation (continued)

Installing the Transducer:

1. Lightly sand the surface of the hull and face of the transducer with 400
grit wet or dry sandpaper.

2. Build a dam using strip caulk about 1/4” tall. Pour about 1/8” of 2-part,
slow cure epoxy in the dam. Place the transducer in the epoxy, turning
the transducer to work out any air bubbles.

3. Weight the transducer in place and allow to cure for 24 hours.

Speed Sensor Installation

The speed sensor should be mounted as near the center of the boat

as possible. Like the transducer, for the speed sensor to operate properly,
it should be located in non-turbulent water. Follow the directions in the
speed sensor installation instructions to assemble the speed sensor with
the mouning bracket, drill holes in the transom, mount the assembly and
route the cable.

Drill a 3/4” hole well above the water line.
Coat the inside of the hole with Marine Sealant.

OK

Adjust the speed sensor so it is parallel with the bottom
of the boat. If the speed sensor is not adjusted properly,
the sonar may experience degraded speed readings.

4

Position Cable Clamps about one-third of
the distance from the hole to the transducer.

Drill 1/8” pilot holes 3/8” deep for the mounting screws.
Coat the screws with Marine Sealant before installing them.

Wiring Harness Installation

The Fishfinder 100 Blue comes with a wiring harness that connects
the unit to power and the transducer with one easy-to-remove connection.
Make sure the wiring harness will reach the unit before beginning
installation.

If it is necessary to extend the power/data wires, use a wire of compa­rable size and keep your extension as short as possible. If the transducer
lead is too short, DO NOT cut the transducer lead to lengthen the cable.
This will void the warranty. Transducer extension cables are available in 10’
or 20’ lengths from your GARMIN dealer.

Wiring to a Fuse Block

If your boat has an electrical system, it may be possible to wire the unit

Install 2-Amp Fuse

directly to an unused holder on your current fuse block. If you are using the
boat’s fuse block, remove the in-line fuse holder supplied with the unit.

Installation

Installing the Wiring Harness

10-18 Volt Boat Supply

+

Installing the Wiring Harness:

1. Determine the polarity of the fuse holder using a Test Light or Volt Meter.

2. Install the Red (+) wire on the Positive Fuse Holder Terminal.

3. Install the Black (-) wire on the Negative Fuse Holder Terminal.

4. Install a 2 amp fuse in the Fuse Holder.

During a typical installation, only the Red and Black wires are used. The
Blue wire supplies NMEA data, and doesn’t have to be connected for normal
operation of the unit. The Yellow wire is not used.

Continued on page 6

2A

-

Boat Ground

Red Wire

Black Wire

Fishfi nder 100 Blue

5

Installation

er/Data

Connection

Wiring Harness Installation (continued)

If your boat does not have a fuse block, the unit can be wired directly
to the battery. Make sure the 2-Amp in-line fuse supplied with the unit
is installed.

Installing the Wiring Harness

Power/Data
Connection

Speed Temp Transducer

Connecting a Transducer to Multiple Sensors

6

The Fishfi nder 100 Blue can be connected to another piece of NMEA-
compatible electronic equipment. If equipped with a capable transducer
and speed sensor, the Fishfi nder 100 Blue sends depth, temperature and
speed information that could be used by, or displayed on another device.

2-Amp In-Line Fuse

Display Installation (Surface Mount)

The Fishfi nder 100 Blue can be mounted to a fl at surface using the

supplied Surface Mount Bracket.

Surface Mounting the Display:

1. Position the Surface Mount Bracket in the desired location. Leave
approximately 2” behind the unit for cable clearance.

2. Mark the location of the four mounting holes with a pencil.

3. Drill pilot holes for the mounting fasteners (not included in kit).

4. Secure the Surface Mount Bracket using the mounting fasteners.

5. Slip the unit into the Surface Mount Bracket.

6. Tighten the knobs to secure the unit to the bracket.

The Surface Mount Bracket is designed to be secured using a fl at head screw.
If you use a screw with a countersunk head, you risk damaging the Surface
Mount Bracket.

Installation

Installing the Display

OK

Surface Mount

Bracket

7

Installation

Installing the Display

Display Installation (Flush Mount)

The Fishfi nder 100 can be mounted fl ush against the dash or electron-

ics rack that is no more than 1/4” thick.

Flush Mounting the Display:

1. Remove the Surface Mount Bracket and Knobs.

2 Cut a 4.3”W x 4.35”H relief hole where the unit will be mounted.

3. Place the display in the relief hole and tape in place.

4. Reinstall the knobs in the unit. Install the surface mount with the cam
lobes pointed toward the unit.

5. Rotate the surface mounting bracket forcing the cam lobes to pull the
unit tight against the surface. Tighten the knobs.

Pull bracket down until cam lobe contacts surface

8

Testing the Installation

While it is possible to perform some checks with the boat trailered, the

boat should be in the water to properly test the installation.

Press the Power button and the Fishfinder 100 Blue should power on.
If the unit fails to power on, verify that the wiring adapter is seated properly
in the back of the unit, the Red and Black wires are connected to the correct
polarity, and the 2-Amp fuse is installed and not blown. If the unit is
connected to a power supply that exceeds 18 VDC, a ‘Battery Voltage High’
warning will be displayed and the unit will turn off.

As the unit powers on, it should immediately start showing the bottom.
Verify that the unit is not in the simulator mode. If the unit is in the
simulator mode, make sure that the transducer is connected to the wiring
harness.

To test the transducer and speed sensor installation, gradually increase
the boat’s speed while checking the unit operation. If the unit displays
intermittently or fails to display, verify that the transducer and speed sensor
are aligned parallel with the bottom. If necessary, adjust their heights until
the unit operates correctly. It may be necessary to make several adjustments
to ensure proper operation throughout the speed range. If the signals do
not improve, it may be necessary to move the transducer or speed sensor
to a different location.

If the Fishfi nder 100 Blue is in Simulator Mode, the
message “Simulator On” will be displayed along the
bottom of the screen. The message will be replaced
by the “S” icon indicating that the unit is running
in simulator mode.

Installation

Testing the Installation

Simulator Message and Icon

When adjusting the depth of the transducer, make the adjustments in small
increments, no more than 1/8”. Placing the transducer or speed sensor too
deep can adversely affect the boat’s performance and increase the risk that they
may strike underwater objects.

9

Unit Operation

10

Keypad Functions

Arrow Keys

The Arrow keys are used to select items on the Adjustment Bar and
Setup Menu and to change fi eld data.

Enter Key

The ENTER key is used to activate/deactivate the Adjustment Bar and
Setup Menu data fi elds for review or change.

Setup Key

The SETUP key is used to activate/deactivate the Setup Menu.

Power Key

The Power key is used to turn the unit on/off and to activate the display
backlight. Press and hold to turn the unit off. Press briefl y and release
to activate, and change the level of the backlight.

At the top left of the display you will find the Adjustment Bar and
a variety of user-selectable information including Depth, Battery Voltage,
Water Temperature, and Speed Over Water. To provide data on Speed Over
Water, the Fishfinder 100 Blue requires an additional speed sensor.

Unit Operation

The Depth Scale and the Flasher are displayed from top to bottom
along the right side of the display. Messages and Alarm Icons are displayed
along the bottom.

The Fishfinder 100 Blue has three levels of display backlighting: Off,
Low and High. The backlight is activated by momentarily pressing the
Power key. To change the backlight level, press the Power key repeatedly.

Adjustment Bar

Depth

Battery Voltage

Water Temperature

Speed Over Water

Depth Scale

Flasher

Transducer Frequency

Alarm/Message Icons

Describing The Display

If the unit is unable to track the bottom for any reason,
the digits in the depth window will fl ash on and off to
alert the user that the unit is not tracking the bottom.

11

Unit Operation

Using the Adjustment Bar

The Adjustment Bar allows direct access to the most commonly
changed settings. These include the depth Range, the Zoom setting, and
the Gain (sensitivity) of the unit.

Current Setting

Adjustment List

12

The Adjustment Bar

Range Adjustment

Place the highlight (white bar) over the desired selection using the
RIGHT or LEFT Arrow key, and the current setting will be displayed in
the highlight. To immediately change the setting, press the UP or DOWN
Arrow key. If you wish to review the available settings before making a
change, press the ENTER key to activate the adjustment list.

Range

The Range Adjustment is used to set the display depth range. The
unit can be set to automatically track the bottom or set to a user-specified
depth range.

To select a Depth Range:

1. Highlight ‘Range’ on the Adjustment Bar.

2. Using the UP or DOWN Arrow, place the pointer at the desired depth
range.

To set the unit to automatically track the bottom:

1. Highlight ‘Range’ on the Adjustment Bar.

2. Using the UP or DOWN Arrow, select ‘Auto’ at the top of the
adjustment list.

Zoom

The Zoom Adjustment is used to quickly select a display zoom scale.

To change the Zoom Scale:

1. Highlight ‘Zoom’ on the Adjustment Bar.

2. Using the UP or DOWN Arrow, select the desired display zoom level.
When a scale other than ‘No Zoom’ is selected, the Adjustment Bar will
display a new selection labeled ‘View.’

View

The View Adjustment is available only when a Zoom Scale other than
‘No Zoom’ is selected. This setting allows you to select a specific area to
view on the display, or allows the unit to automatically select a viewing area
based on the bottom.

To change the View:

1. Highlight ‘View ‘on the Adjustment Bar.

2. Press the UP or DOWN Arrows to change the setting.

To have the unit automatically set a View:

1. Highlight ‘View’ on the Adjustment Bar.

2. Using the UP or DOWN Arrow, move the slider to the top or bottom of
the range, then release and press the Arrow again.

Unit Operation

The Adjustment Bar

Zoom Adjustment

View Adjustment

13

Unit Operation

The Adjustment Bar

Gain

The Gain Adjustment allows the user to control the sensitivity of the
unit’s receiver. This provides some flexibility in what is seen on the display.
To see more detail, increase the receiver sensitivity by selecting a higher gain
(+). If there is too much detail or if the screen is cluttered, lowering the
sensitivity (-) may increase the clarity of the display.

To change the Gain:

1. Highlight ‘Gain’ on the Adjustment Bar.

2. Using the UP or DOWN Arrows, move the pointer to the desired setting.

14

Minimum Gain

Normal Gain Maximum Gain

SETUP MENU

The Setup Menu contains the unit settings that should not require
frequent change. The Setup Menu is divided into eight tabs: Chart, Tools,
Numbers, Alarms, System, Calibrations, Units, and Memory. Each tab will
be described in more detail in this section.

To enter and exit the Setup Menu, press the SETUP button on the face
of the unit. The first time that the SETUP button is pressed, the Setup
Menu will be displayed with the ‘Chart’ tab highlighted in black. Pressing
the UP or DOWN arrow will move the highlight between the tab selections.
Press the RIGHT arrow to access the selection fields. Each time the Setup
Menu is accessed, the unit will return to the last edited selection field. Press
the LEFT arrow key to get back to the tabs.

Chart Tab

The ‘Chart’ tab allows the user to determine the appearance of the
scrolling chart display. To access the ‘Chart’ tab, place the highlight over
it using the arrow keys.

Frequency

The ‘Frequency’ setting allows you to choose a transducer frequency.
Frequency refers to the “pitch” of the sound that the transducer sends and
receives. You may choose ‘200kHz’ (default), ‘50kHz’ or ‘Dual’ frequency.

Unit Operation

Setup Menu: Chart Tab

Frequency Settings

Continued on page 16

15

Unit Operation

Setup Menu: Chart Tab

Fish Symbols

— All available information will be displayed.

— Suspended targets will display as symbols. In this mode,

background information will still be displayed making
fi sh identifi cation easier.

— Same as above with target depth displayed.

— Suspended targets displayed as symbols. No background

information will be displayed in this mode.

— Same as above with target depth displayed.

16

Frequency (continued)

The wide cone angles associated with low frequencies (40° for 50kHz)
provide a large coverage area for fi nding fi sh. However, this also means that
wide cone angles produce less bottom detail and resolution. The narrow
cone angles associated with high frequencies (10° for 200kHz) provide
better bottom resolution and crisper detail, but therefore cannot show a
large coverage area for fi nding fi sh. Dual frequency mode combines the
improved contour detail and depth readings of the 200kHz frequency with
the wide coverage area of the 50kHz frequency.

To select a Frequency:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Frequency’ selection fi eld and press ENTER.

3. Using the UP or DOWN Arrow, choose ‘200kHz,’ 50kHz’ or ‘Dual’ and
press ENTER. The selected frequency will be displayed in the bottom
left-hand corner of the chart.

Fish Symbols

‘Fish Symbols’ allows the user to determine how the chart will display
underwater targets and background information. If ‘Fish Symbols’ is set
to ‘Off,’ the unit will display all of the available information about the
underwater environment. If a fish symbol is selected, the chart will display
only the information related to that symbol.

To select a Fish Symbol:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Fish Symbol’ selection fi eld and press ENTER.

3. Using the UP or DOWN Arrow, select the desired symbol and press
ENTER.

F

NOTE: When the frequency is set to ‘Dual,’ the appearance
of the fi sh symbols will change. Fish returns from the center
of the beam will be black, but the fi sh returns from the edges
of the beam will be clear.

Unit Operation

Whiteline

‘Whiteline’ controls how the unit displays information about the
bottom type (hard or soft). With the Whiteline ‘OFF’, the bottom return
will display as black and contain no information on bottom hardness. With
Whiteline ‘ON’, the bottom return will become gray-scaled. The degree of
gray-scale can be used to determine bottom hardness. See page 33 for more
details on this feature.

To change the Whiteline Setting:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Whiteline’ selection fi eld and press ENTER.

3. Choose ‘On’ or ‘Off’ and press ENTER to accept the selection.

Scroll Speed

You can adjust the speed that the chart scrolls from right to left by
using the ‘Scroll Speed’ selection fi eld. If you are sitting still or the chart is
moving too fast, slowing the scroll rate can be benefi cial.

To adjust the Scroll Speed:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Scroll Speed’ selection fi eld and press ENTER.

3. Choose ‘Fast,’ ‘Medium,’ ‘Slow’ or ‘Pause,’ then press ENTER to accept
the selection.

Setup Menu: Chart Tab

Fish Symbols in Dual Frequency Mode

Whiteline Selections

17

Unit Operation

Scale

The depth ‘Scale’ is displayed vertically along the right side of the chart.
The depth ‘Scale’ can be configured to display in four different modes: as an
‘Overlay,’ in the ‘Corners,’ with ‘Basic’ or ‘No Scale.’

Setup Menu: Chart Tab

Scale — ‘Overlay’

18

Scale — ‘Corners’

To change the Scale Setting:

1. Highlight the ‘Chart’ tab on the Setup Menu.

2. Highlight the ‘Scale’ selection fi eld and press ENTER.

3. Choose ‘Overlay,’ ‘Corners,’ ‘Basic’ or ‘No Scale,’ then press ENTER to
accept the selection.

Scale — ‘Basic’

Scale — ‘No Scale’

Tools Tab

The ‘Tools’ tab contains the ‘Flasher,’ ‘Simulator’ and ‘Noise Reject’
tools. The ‘Noise Reject’ and ‘Flasher’ tools are used to enhance the chart
and help in identifying and providing information about an underwater
return. The ‘Simulator’ tool is used to enhance the simulator mode by
allowing you to customize the simulated transducer selection. To access the
‘Tools’ tab, place the highlight over it using the arrow keys.

Flasher

With the ‘Flasher’ tool active, a graphic Flasher representation will be
displayed on the far right side of the chart. This graphic Flasher displays
structure and bottom returns much the same as a true Flasher. You may
find this feature particularly useful when using ‘Fish Symbols.’

To Turn the Graphic Flasher on and off:

1. Highlight the ‘Tools’ tab on the Setup Menu.

2. Highlight the ‘Flasher’ selection fi eld and press ENTER.

3. Select ‘On’ or ‘Off’ and press ENTER to accept the selection.

Simulator

The ‘Simulator’ tool allows you to select a simulated transducer type for
use with the Fishfinder 100 Blue’s built-in display simulator. These choices
allow the simulator to more accurately depict actual operation of the unit.
For details on using the simulator, see page 35.

Unit Operation

Setup Menu: Tools Tab

Graphic Flasher Activated

Noise Reject

The ‘Noise Reject’ tool helps filter unwanted noise from the chart. The
‘Noise Reject’ tool can be turned ‘Off,’ set for ‘Auto’ (automatic) adjustment

or set for ‘Manual’ adjustment.

Continued on page 20

Remember when setting the Noise Reject tool, the
higher the noise rejection setting, the more likely
the unit is to not show fi sh or structure.

19

Unit Operation

Setup Menu: Tools/Numbers Tabs

Noise Reject Manual Adjustment Slider

Noise Reject (continued)

To change the Noise Reject Setting:

1. Highlight the ‘Tools’ tab on the Setup Menu.

2. Highlight the ‘Noise Reject’ selection fi eld and press ENTER.

3. Choose ‘Off,’ ‘Auto,’ or ‘Manual’ and press ENTER.

To manually adjust the Noise Reject Setting:

1. Select ‘Manual’ in the ‘Noise Reject’ fi eld of the ‘Tools’ tab of the Setup
Menu, then press ENTER. A slider will appear below the ‘Noise Reject’
selection fi eld.

2. Use the UP/DOWN Arrows to highlight the slider, then press ENTER.

3. Use the LEFT/RIGHT Arrows to manually adjust the Noise Reject Slider
to the desired setting, then press ENTER.

Numbers Tab

The ‘Num’ (Numbers) tab allows you to choose whether you would
like to see normal or large numbers on the chart. You can also configure
the unit to display ‘Battery Voltage,’ (water) ‘Temperature,’ and ‘Speed’ Over
Water if the unit is equipped with capable sensors. You can also set up how
the unit finds the digital ‘Depth Number.’ To access the ‘Num’ tab, place the
highlight over it using the arrow keys.

Number Size

This setting determines the size of the numbers displayed in the
‘Depth,’ ‘Temperature,’ ‘Battery Voltage’ and ‘Speed’ fields on the chart.

Normal Numbers

20

Large Numbers

To select Normal or Large Numbers:

1. Highlight the ‘Num’ tab on the Setup Menu.

2. Highlight the ‘Number Size’ selection fi eld and press ENTER.

3. Choose ‘Normal’ or ‘Large’ and press ENTER to accept the selection.

Battery Volts

The Fishfinder 100 Blue can display the current battery voltage on

the chart.

To show or hide the Battery Volts display fi eld:

1. Highlight the ‘Num’ tab on the Setup Menu.

2. Highlight the ‘Battery Volts’ selection fi eld and press ENTER.

3. Choose ‘Show’ or ‘Hide’ and press ENTER to accept the selection.

Temperature

The Fishfinder 100 Blue can display the water temperature when
equipped with a temperature-sensing transducer. The unit will auto­matically sense when a temperature-capable transducer is connected. The
temperature field can be shown or hidden, regardless of the transducer
installed.

Unit Operation

Setup Menu: Numbers Tab

To set the Temperature display fi eld:

1. Highlight the ‘Num’ tab on the Setup Menu.

2. Highlight the ‘Temperature’ selection fi eld and press ENTER.

3. Choose ‘Auto,’ ‘Show’ or ‘Hide,’ then press ENTER to accept the
selection.

Battery Volts Selections

Temperature Display Selections

21

Unit Operation

Setup Menu: Numbers Tab

Speed Display Selections

Speed

The Fishfinder 100 Blue can display the boat’s ‘Speed’ Over Water
when equipped with a speed sensor. When set to ‘Auto,’ the unit will
automatically sense when a capable sensor is connected and display the
boat’s speed.

To set the Speed display fi eld:

1. Highlight the ‘Num’ tab on the Setup Menu.

2. Highlight the ‘Speed’ selection fi eld and press ENTER.

3. Choose ‘Auto,’ ‘Show’ or ‘Hide,’ then press ENTER to accept the
selection.

Depth Number

The ‘Depth Number’ setting refers to how the unit finds the digital
depth number that is displayed in the upper left corner of the screen.
When set to ‘Auto,’ the unit will show the most accurate digital depth
possible. However, this may cause the chart to update slower as the unit
calculates the ‘Auto’ depth. When set to ‘From Chart’ (default), the unit
finds the digital depth from the same image you see on the chart. The ‘From
Chart’ setting allows the chart to update faster than when the unit is set to
‘Auto’ and is recommended when using the unit in deep water.

22

Depth Number Selections

F

NOTE: In ‘From Chart’ mode, the Fishfi nder 100 Blue may
not be able to get the digital Depth Number if the bottom
is not visible on the chart. Adjust the Depth Range on the
Adjustment Bar until the bottom is visible, or change the
setting to ‘Auto’ to get the digital Depth Number.

To change the Depth Number Setting:

1. Highlight the ‘Num’ tab on the Setup Menu.

2. Highlight the ‘Depth Number’ selection fi eld and press ENTER.

3. Choose ’Auto’ or ‘From Chart,’ then press ENTER to accept the
selection.

Alarm Tab

The ‘Alarm’ tab allows you to activate and configure the four alarms
available in the Fishfinder 100 Blue. To access the ‘Alarm’ tab, place the
highlight over it using the arrow keys. See page 37 for alarm icons and
messages.

Fish Alarm

The ‘Fish Alarm’ can be confi gured to sound by fi sh size. There are
four different alarm selections: ‘Off,’ ‘Small, Medium and Large,’ ‘Medium
and Large,’ or ‘Large.’ The ‘Fish Alarm’ will sound with or without the ‘Fish
Symbols’ activated on the Chart Tab of the Setup Menu.

To set a Fish Alarm:

1. Highlight the ‘Alarm’ tab on the Setup Menu.

2. Highlight the ‘Fish Alarm’ selection fi eld and press ENTER.

3. Choose the desired setting, then press ENTER to accept the selection.

Unit Operation

Setup Menu: Numbers/Alarms Tabs

Fish Alarm Selections

23

Unit Operation

Setup Menu: Alarms Tab

Shallow Water

The ‘Shallow Water’ Alarm can be set to sound a warning at a depth
determined by the user. The alarm must be activated before the unit will
sound a warning. The alarm must be activated before the unit will sound
a warning.

To activate/deactivate the Shallow Water Alarm:

1. Highlight the ‘Alarm’ tab on the Setup Menu.

2. Highlight the ‘Shallow Water’ checkbox.

3. Pressing ENTER will insert or remove a check mark in the checkbox.

To set the Shallow Water Alarm depth:

1. Highlight the ‘Shallow Water’ depth fi eld and press ENTER.

2. Use the Arrow Keys to input the desired depth, then press ENTER to
accept the setting.

24

Shallow Water Alarm

Deep Water Alarm

Deep Water

The ‘Deep Water’ Alarm can be set to sound a warning at a depth
determined by the user. The alarm must be activated before the unit will
sound a warning.

To activate/deactivate the Deep Water Alarm:

1. Highlight the ‘Alarm’ tab on the Setup Menu.

2. Highlight the ‘Deep Water’ checkbox.

3. Pressing ENTER will insert or remove a check mark in the checkbox.

To set the Deep Water Alarm depth:

1. Highlight the ‘Deep Water’ depth fi eld and press ENTER.

2. Use the Arrow Keys to input the desired depth, then press ENTER to
accept the setting.

Battery Volts

The ‘Battery Volts’ Alarm can be set to warn you when the battery

reaches a critical state of discharge.

To activate/deactivate the Battery Volts Alarm:

1. Highlight the ‘Alarm’ tab on the Setup Menu.

2. Highlight the ‘Battery Volts’ checkbox.

3. Pressing ENTER will insert or remove a check mark in the checkbox.

To set the Battery Volts Alarm:

1. Highlight the ‘Battery Volts’ fi eld and press ENTER.

2. Use the Arrow Keys to input the desired voltage, then press ENTER to
accept the setting.

System Tab

The ‘Sys’ tab contains the ‘Contrast,’ ‘Beeper,’ ‘NMEA Output’ and

‘Language’ setups. To access the ‘Sys’ tab, use the arrow keys to highlight it.

Contrast

The display ‘Contrast’ may need to be adjusted to compensate for light

levels or viewing angles.

To adjust the Contrast:

1. Highlight the ‘Sys’ tab on the Setup Menu.

2. Highlight the ‘Contrast’ Adjustment fi eld and press ENTER.

3. Using the Arrow Keys, move the slider right to darken the screen or
left to lighten the screen. When fi nished, press ENTER to accept the
setting.

Unit Operation

Setup Menu: Alarms/System Tabs

Battery Volts Alarm

Contrast Adjustment Slider

25

Unit Operation

Setup Menu: System Tab

Beeper Selections

Beeper

The ‘Beeper’ fi eld contains three settings: ‘Off,’ ‘Alarms Only,’ and ‘Key

& Alarm.’

To change the Beeper Setting:

1. Highlight the ‘Sys’ tab on the Setup Menu.

2. Highlight the ‘Beeper’ fi eld and press ENTER.

3. Choose ‘Off,’ ‘Alarms Only,’ or ‘Key, Alarm,’ then press ENTER to accept
the setting.

NMEA Output

The Fishfi nder 100 Blue has the ability to output information about
Depth, Speed, and Water Temp for display on another NMEA-compatible
device.

To activate/deactivate the NMEA Output:

1. Highlight the ‘Sys’ tab on the Setup Menu.

2. Highlight the ‘NMEA Output’ fi eld and press ENTER.

3. Choose ‘Off’ or ‘On,’ then press ENTER to accept the setting.

Language

To select a Language:

1. Highlight the ‘Sys’ tab on the Setup Menu.

2. Highlight the ‘Language’ fi eld and press ENTER.

3. Use the Arrow Keys to select the desired language from the list and
press ENTER to accept the setting.

26

NMEA Output Selections

Calibrations Tab

The ‘Cal’ tab contains the ‘Keel Offset’ and ‘Water Type’ setups, and a

‘Calibrate Speed’ function for use when a speed sensor is installed.

Keel Offset

The ‘Keel Offset’ fi eld allows the user to offset the depth reading for a

keel or for the draw on a larger vessel.

To set a Keel Offset:

1. Highlight the ‘Cal’ tab on the Setup Menu.

2. Highlight the ‘Keel Offset’ fi eld and press ENTER.

3. Use the Arrow Keys enter a new offset, then press ENTER to accept.

Water Type

Since sound waves travel through fresh and salt water at different rates,

it is necessary to select the ‘Water Type’ to ensure accurate depth readings.

To change the Water Type:

1. Highlight the ‘Cal’ tab on the Setup Menu.

2. Highlight the ‘Water Type’ selection fi eld and press ENTER.

3. Choose ‘Fresh’ or ‘Salt,’ then press ENTER to accept the selection.

Calibrate Speed

The ‘Calibrate Speed’ fi eld will be enabled when a speed sensor is
installed or when you are in simulator mode. This allows you to calibrate
the Fishfi nder speed to your boat’s speedometer or to your GPS speed.

To calibrate the Speed:

1. Highlight the ‘Cal’ tab on the Setup Menu.

2. Highlight the ‘Calibrate Speed’ button and press ENTER.

3. Run your boat, noting your top speed. Stop the boat and press ENTER.

4. With the speed fi eld highlighted, press ENTER and input your top
speed. Highlight ‘OK’ and press ENTER to fi nish the calibration.

Unit Operation

Setup Menu: Calibrations Tab

Transducer at Surface

Enter (+) positive number to show
depth from bottom of keel

Transducer at Bottom of Keel

Enter (-) negative number to show
depth from surface

27

Unit Operation

Setup Menu: Units Tab

Depth Selections

28

Speed Selections

Temperature

Selections

Units Tab

The ‘Units’ tab contains settings for ‘Depth,’ ‘Temperature’ and ‘Speed.’

To access the ‘Units’ tab, use the arrow keys to highlight it.

Depth

The ‘Depth’ fi eld can be confi gured to display in Feet (ft), Meters (mt)

or Fathoms (fa).

To select a Depth Unit:

1. Highlight the ‘Units’ tab on the Setup Menu.

2. Highlight the ‘Depth’ fi eld and press ENTER.

3. Select ‘Feet,’ ‘Meters’ or ‘Fathoms,’ then press ENTER to accept the
new setting.

Temperature

If equipped with a temperature capable transducer or separate
temperature sensor, the unit can display water temperature in Fahrenheit
(°F) or Celsius (°C).

To Select a Temperature Unit:

1. Highlight the ‘Units’ tab on the Setup Menu.

2. Highlight the ‘Temperature’ fi eld and press ENTER.

3. Select ‘Fahrenheit’ or ‘Celsius,’ then press ENTER to accept the new
setting.

Speed

If equipped with a speed sensor, the unit can display the boat’s ‘Speed’
Over Water. The unit can be confi gured to display ‘Miles-Per-Hour’ (mh),
‘Kilometers-Per-Hour’ (kh), or ‘Nautical Miles-Per-Hour’ (kt).

To select a Speed Unit:

1 Highlight the ‘Units’ tab on the Setup Menu.

2. Highlight the ‘Speed’ fi eld and press ENTER.

3. Select ‘Miles/hr,’ ‘Kilom/hr’ or ‘Knots,’ then press ENTER to accept the
new setting.

Memory Tab

The ‘Mem’ tab contains the settings for unit memory and allows you to
reset the unit to the factory settings and review the software version. To
access the ‘Memory’ tab, use the arrow keys to highlight it.

Remember

The Fishfi nder 100 Blue can be set to remember it’s settings each time
you power it on. You can set it to remember the settings in the Setup
Menu (‘Setup Only’) or the unit’s settings in both the Setup Menu and the
Adjustment Bar (‘All’).

To select a Memory Setting:

1. Highlight the ‘Mem’ tab on the Setup Menu.

2. Highlight the ‘Remember’ fi eld and press ENTER.

3. Choose ‘All’ or ‘Setup Only,’ then press ENTER to accept the selection.

Factory Setup

To restore the Factory Settings:

1. Highlight the ‘Mem’ tab on the Setup Menu.

2. Highlight the ‘Factory’ Setup button and press ENTER.

3. Choose ‘OK’ to reset the unit or ‘Cancel’ to abort.

Software Version

The ‘Software Version’ Button will report information about the current
software version in the unit and display the Unit ID Number.

Unit Operation

Setup Menu: Memory Tab

Remember Selections

Restore

Factory Settings

To activate the Software Version Window:

1. Highlight the ‘Mem’ tab on the Setup Menu.

2. Highlight the ‘Software Version’ button and press ENTER.

3. Press ENTER to close the information window.

Software Version Information

29

On the WaterOn the Water

Unit Operation and the Chart

1

2

3

This fi sh is currently in a Dead Zone and is not detected
by the sonar. The fi sh is in the coverage area of the
transducer, but remember the fi rst strong return sets the
bottom level. The fi sh will never be detected since the
bottom level will never be set below the fi sh.

1

2

3

Understanding Sonar

If you are unfamiliar with sonar, or need help determining what is
displayed on the chart, then this section may be for you. This section
is intended to help the novice user gain some understanding of how the
Fishfinder 100 Blue operates and how it can help improve their fishing
productivity.

To understand what the unit is displaying, it is important to have a
general knowledge of how the unit works and how it determines what to
display. Briefly described, the unit operates by transmitting sound waves
toward the bottom of a lake, stream or seabed in a cone shaped pattern.
When a transmitted sound wave strikes an underwater object such as the
bottom, a piece of structure, or a fish, sound is reflected back to the
transducer. The transducer collects the reflected sound waves and sends
the data to the unit to be processed and displayed on the chart. The
underwater data is displayed on the chart in the order that it is returned:
first returned—first on the chart.

The diagram in the sidebar demonstrates this, showing an underwater
scene as it would be displayed on the chart. Generally speaking, if the only
thing between the transducer and the bottom is water, the first strong
return will come from the bottom directly below the transducer. This first
strong return sets the bottom level. Weaker secondary returns provide the
detailed data. Stronger returns will display in darker colors, black being
the strongest return.

30

Transducer Coverage

The area covered by the transmitted sound waves is determined by the
cone angle of the transducer and the water depth. The 50kHz frequency
provides a 40° cone angle, with a coverage width that is approximately 2/3
of the water depth. As shown in the sidebar, the 40° cone angle (50kHz
frequency) approximately covers the area of a 20 foot diameter circle at a
30 foot depth. The 200kHz frequency provides a 10° cone angle, with a
coverage width that is approximately 2/10 of the water depth. As shown,
the 10° cone angle (200kHz frequency) approximately covers the area of a
6 foot diameter circle at a 30 foot depth.

When using the Fishfinder 100 Blue in ‘Dual’ frequency mode, the unit
transmits both 50kHz and 200kHz signals at the same time. The ‘Dual’
frequency capability of the Fishfinder 100 Blue allows the user to have
a large coverage area and still retain good bottom resolution. When in
‘Dual’ frequency mode the unit uses the 200kHz to display detailed bottom
information, keeping “Dead Zones” to a minimum, and the 50kHz signal
for the large coverage area.

200kHz - 10˚ Cone Angle

72" coverage at 30'

Fish returns from the 50kHz and 200kHz beams will appear differently
on the display. The 50kHz beam tends to show longer fish returns than
the 200kHz beam. The examples below show simulated fish returns at
50 and 200 kHz.

On the Water

On the Water

Transducer Coverage

50kHz - 40˚ Cone Angle

20' coverage at 30'

50kHz 200kHz

31

On the WaterOn the Water

Understanding the Chart

Remember that the Fishfi nder displays a 2D picture
of the underwater environment. The fi sh and tree
could be located anywhere in the coverage area
produced by the sonar cone at the object’s indicated
depth.

Understanding the Chart

It is important to understand that the unit does not display a 3-D
representation of the underwater environment. The unit can display mul­tiple things at the same time, but cannot determine from where the return
originated. It can only determine when the return was received.

Examples 1and 2 provides a look at the underwater world from a top
view, and illustrate how these views would be displayed on the chart. On
both charts it appears the fi sh and tree are side by side as shown in Example

1. However, when we look at Example 2., we see that the fi sh can be
several feet from the tree. It is important to remember that the Fishfi nder
cannot determine where in the coverage area the tree or fi sh are, only that
the returns were received from the same depth.

32

Enlarged
Transducer
View

Enlarged
Transducer
View

Example 1.

Branches

Fish

Branches

Fish

Example 2.

Whiteline

The Fishfi nder 100 Blue can help you to determine if the bottom is
hard or soft. When the sonar soundwaves are refl ected back by the bottom,
a hard bottom will return a stronger signal than a soft bottom. The stronger
the bottom return, the wider the bottom layer is displayed. The unit uses
the Whiteline function to make this bottom layer information easier to
distinguish.

When viewing the display without Whiteline active, the bottom return
is black. While you can make some determination of the bottom type,
the black return makes this more diffi cult. With the Whiteline active, the
bottom return appears layered in shades of gray and black, which makes
determining the bottom type easier and more reliable. Example 3 shows
the bottom return with and without the Whiteline activated.

On the Water

On the Water

Understanding the Chart

Whiteline can also help you to determine the type of
bottom structure that is displayed on the chart. By
determining the hardness of the structure you can
make a better informed decision as to the type of
structure.

Whiteline Turned Off

Whiteline

Example 2.

Whiteline Activated

Structure is hard, probably a
rock or stump

Structure is soft, probably a
mud pile

33

On the WaterOn the Water

Thermoclines

A rough defi nition of a thermocline is a break in water where the
water temperature changes at a faster rate than the water above it. The
thermocline is usually displayed as a gray level, as shown below.

Understanding the Chart

34

One of the unique features offered by GARMIN is See-Thru technology.
A benefit of See-Thru technology is that it allows the Fishfinder 100 Blue
to see fish inside thermoclines.

Thermocline

Simulator Mode

The Fishfinder 100 Blue comes with a built-in simulator. While in
simulator mode, the unit will display a random bottom scene, and the
Fishfinder 100 Blue can be controlled just as if it were on the water. Using
simulator mode allows the user to practice and learn the operation of the
unit at home rather than on the water.

If the Fishfinder 100 Blue is turned on without a transducer connected,
the unit will start in simulator mode. Also the unit can be switched into
simulator mode by selecting one of the simulated transducer options from
the ‘Simulator Selection’ field as described below. The unit will indicate that
it is running in simulator mode by displaying a message across the bottom
of the screen. The message will be replaced by the “S” simulator mode icon
in the lower left corner of the screen.

The unit can be configured to act as if a variety of transducers are
installed while in the simulator mode.

To select a specifi c Transducer:

1. Press the SETUP button on the face of the unit.

2. Using the Arrow keys, highlight the ‘Tools’ tab then the ‘Simulator’
selection fi eld.

3. Press ENTER. Choose the desired transducer from the list.

4. Press ENTER to accept the transducer selection.

On the Water

On the Water

Simulator Mode

Simulator Message and Icon

Simulator Transducer Selections

35

On the Water

Appendix A

Specifi cations

Physical

Case: Fully gasketed, high-impact plastic alloy

Display: 3.3” x 2.0” (8.3 x 5 cm) 160 H x 100 W pixels, FSTN LCD with

amber LED backlighting

Size: 4.93” H x 6.3” W x 2.7” D (12.5 x 13.5 x 6.9 cm)

Weight: 13 oz.

Temperature Range: +5° to 158°F (-15°C to 70°C)

Waterproof: IEC 529, level IPX-7 (submerged to 1 meter for 30 minutes)

Power

Input: 10 to 18 VDC with High Voltage Protection

Usage: 7 watts maximum

Nominal: 12 VDC @ 0.28 amps

Performance

Sonar Power Output: 300 watts (RMS), 2400 watts (peak to peak)

Frequency: 200/50 kHz (10°/40°)

Depth 1200 foot max depth*

NMEA

Support: NMEA 0183 Versions 2.0 - 2.3

Output Sentences: DBT, DPT, NTW, VHW

36

* Depth capability is dependent on water salinity, bottom type and other water

conditions.

Specifi cations subject to change without notice.

Alarm Messages and Icons

The Fishfinder 100 Blue displays a message when an alarm is tripped.
To clear the message, press the ENTER key. If the ENTER key is not
pressed, the unit will automatically remove most messages after 10 seconds
and display a reminder icon in the lower left corner of the chart until the
alarm is no longer valid.

On the WaterAppendix B

Messages and Alarms

Battery Voltage Low

Deep Water Alarm

Shallow Water Alarm

Supply Voltage Low

Supply Voltage High

Unit Needs Repair

Unit Needs Repair

Memory Deleted

Increase Battery Voltage

Alarm Setting

Fish Alarm

37

Customer Service .................................................................................i

On the Water

Index

A

Accessories .........................................................................................iii

Adjustment Bar ........................................................................... 12-14

Alarm Messages.................................................................................37

Alarm Tab.............................................................................. 23-25, 37

Arrow Keys........................................................................................10

B

Battery...............................................................................................37

Battery Voltage Alarm ........................................................................25

Battery Voltage Display......................................................................21

Beeper ...............................................................................................26

Bottom Structure.................................................................... vi, 32-33

C

Calibrate Speed .................................................................................27

Calibrations Tab ................................................................................27

Chart. ......................................................................................... 32-34

Chart Tab .................................................................................... 15-18

Contrast ............................................................................................25

38

D

Deep Water Alarm............................................................................. 24

Depth Number .............................................................................22-23

Depth Range...................................................................................... 12

Depth Scale .......................................................................................18

Depth Units....................................................................................... 28

Display......................................................................................... vi, 11

Display Installation...........................................................................7-8

E

Enter Key ..........................................................................................10

F

Factory Setup ....................................................................................29

Fish Alarm ........................................................................................ 23

Fish Symbols................................................................................16-17

Flasher ..............................................................................................19

Flush Mounting the Display ................................................................ 8

Frequency ....................................................................................15-16

G

Gain Adjustment ...............................................................................14

Graphic Flasher................................................................................. 19

I

In-Hull Installation.............................................................................. 3

Installing the Display........................................................................7-8

Installing the Speed Sensor.................................................................. 4

Installing the Transducer ..................................................................2-4

Installing the Wiring Harness ........................................................... 5-6

K

Keel Offset.........................................................................................27

Keypad..............................................................................................10

L

Language...........................................................................................26

Limited Warranty................................................................................ii

On the Water

Index

M

Memory Tab......................................................................................29

Messages ...........................................................................................37

Mounting the Display...................................................................... 7-8

Mounting the Speed Sensor.................................................................4

Mounting the Transducer ................................................................ 2-4

N

NMEA Output...................................................................................26

Noise Reject ................................................................................ 19-20

Number Size .....................................................................................20

Numbers Tab............................................................................... 20-23

O

Operation..........................................................................................30

P

Packaging...........................................................................................iii

Power Key .........................................................................................10

Product Registration.............................................................................i

R

Range Adjustment .............................................................................12

Remember Settings............................................................................29

Restore Factory Settings ....................................................................29

S

Scale................................................................................................. 18

Scroll Speed .....................................................................................17

Setup Key......................................................................................... 10

Setup Menu................................................................................. 15-29

Shallow Water Alarm........................................................................24

Simulator ...................................................................................19, 35

Software Version............................................................................... 29

Sonar. .............................................................................................. 30

Specifi cations ...................................................................................36

Speed Calibration............................................................................. 27

Speed Display................................................................................... 22

Speed Sensor Installation.................................................................... 4

Speed Units...................................................................................... 28

Surface Mounting the Display............................................................. 7

System Tab ..................................................................................25-26

T

Table of Contents ........................................................................... iv-v

Temperature Display ........................................................................21

Temperature Units............................................................................ 28

Testing the Installation .......................................................................9

Thermocline................................................................................ vi, 34

39

On the Water

Index

T

Tools Tab.....................................................................................19-20

Transducers............................................................................ 1, 31, 35

Transom Mount Installation ............................................................... 2

U

Understanding Sonar........................................................................ 30

Understanding the Chart.............................................................32-34

Units Tab.......................................................................................... 28

V

View Adjustment.............................................................................. 13

W

Warranty............................................................................................ ii

Water Depth................................................................................ vi, 28

Water Temperature ...................................................................... vi, 28

Water Type ....................................................................................... 27

Whiteline ...................................................................................17, 33

Wiring Harness Installation .............................................................5-6

Z

Zoom Adjustment ............................................................................13

40

© 2001 GARMIN Corporation

GARMIN International, Inc.

1200 East 151st Street, Olathe, Kansas 66062, U.S.A.

GARMIN (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ, U.K.

GARMIN Corporation

No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan

www.garmin.com

Part Number 190-00198-00 Rev. A