Fishfinder 340C Owner’s Manual iINTRODUCTION > ABOUT THIS MANUALINTRODUCTIONThank you for choosing the Garmin® Fishfinder 340C. TheFishfinder 340C is a full-featured, color sonar that offers a choiceof display styles, a dual beam or dual frequency option, and manymore features, including the following:• Ultrascroll™, which gives you a much faster update rate onyour Sonar Pages.• Auto Gain, which enables you to see more fish andstructures.• CANet™ capability, which enables you to connect your unitto CANet-capable Garmin chartplotters, so you can read theSonar Pages on chartplotters located elsewhere in the boat.• Round flasher, which gives you an option for how to viewthe sonar.• Whiteline, which helps you to interpret bottom hardness.• 2x and 4x automatic and manual zoom.• Adjustable keel offset.• Alarms for fish size, shallow water, deep water, and lowbattery.• NMEA sonar data output and navigation data input.About This ManualTo get the most out of your Fishfinder 340C, read this manual andlearn the operating procedures. This manual includes the following:• Introduction—contains the Table of Contents, productregistration, contact, and cleaning information.• Getting Started—provides general information that canhelp you before you install and use your Fishfinder 340C.• Installing the Fishfinder 340C—covers the installation andtesting for the Fishfinder 340C.• Using the Fishfinder 340C—provides details about thefeatures and operations of the Fishfinder 340C.• Appendix—contains information, such as specifications,optional accessories, and messages that might appear. Youcan also find warranty information in the Appendix.• Index—helps you quickly find information in this manual.This manual uses the term Warning to indicate a potentiallyhazardous situation, which, if not avoided, could result in death orserious injury.This manual uses the term Caution to indicate a potentiallyhazardous situation, which, if not avoided, may result in minorinjury or property damage. It may also be used without the symbolto alert you to avoid unsafe practices.