Garmin 140, 90 the Garmin Web site at www.garmin.com

For the latest free software updates (excluding map data) throughout the life of your Garmin products, visit

the Garmin Web site at www.garmin.com.

Garmin International, Inc.

1200 East 151st Street, Olathe, Kansas 66062, USA

Garmin (Europe) Ltd.

Liberty House, Hounsdown Business Park, Southampton, Hampshire, SO40 9RB UK

Garmin Corporation

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

www.garmin.com

December 2008

Part Number 190-00582-10 Rev. A

Printed in Taiwan

Contents

Page Page Introduction About This Manual Manual Conventions Table of Contents Product Registration Contact Garmin Warning Getting Started Understanding the Fishfinder Understanding Sonar Understanding Dual Beam Transducer Coverage Understanding the Fishfinder Screen Using Simulator Mode Installing Your Fishfinder Installing the Transducer Mounting the Transducer on a Transom Tool List Page To mount the transducer on a transom: Installing the Fishfinder Unit Selecting a Fishfinder installation Location Mounting the Bracket Assembly To mount the bracket assembly: To install the Fishfinder on the mount bracket: Installing the Wiring Harness Testing the Transom Mount Installation Operating Your Fishfinder Understanding Basic Functions Using the Main Menu Arrow Options and Settings Zoom— Using the Setup Menu Alarms Shallow— feet Graphs Narrow Whiteline— Auto Gain Numbers Units Depth— Feet Meters Appendix Specifications Fishfinder Fishfinder 90 and Fishfinder Optional Accessories Cleaning the Case Cleaning the Screen Storage Water Immersion Software License Agreement Limited Warranty Page Declaration of Conformity (DoC) Index Page the Garmin Web site at www.garmin.com