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