INTRODUCTIONThank you for choosing the Garmin® Fishfinder 250/250C. Thisproduct is designed for easy operation and to provide years ofreliable service.Operations for the Fishfinder 250 and Fishfinder 250C are thesame unless othewise noted. To ensure that you get the most fromthe Fishfinder 250/250C, take time to read this Owner’s Manualand learn how to operate your new unit. This manual breaks downinto three main sections. Getting Started covers the installationand testing for the Fishfinder 250/250C. Basic Operation providesdetailed references to the features and operations of the Fishfinder250/250C and a basic overview of how sonar works and providesinformation on interpreting sonar graphs. The Appendix containsunit specifications and warranty information.Product SupportIf you encounter a problem or just have a question, our ProductSupport Department can be reached Monday-Friday, 8 AM-5 PMCentral Time.Phone: 800/800.1020 or 913/397.8200Online: http://www.garmin.com/contactUs/techSupport.jspCheck the Garmin Web site (www.garmin.com) for links to ProductSupport and Product FAQs.Enjoy your new Fishfinder 250/250C, and once again thank you forchoosing Garmin!Product RegistrationHelp us to better support you by completing our onlineregistration today! Connect to our Web site (www.garmin.com) andlook for the Product Registration link on the Home page. Your unit’sserial number is located on the back of the unit.Use this area to record the serial number in case your Fishfinder250/250C is lost, stolen, or in need of service. Be sure to keep youroriginal sales receipt in a safe place or attach a photocopy to theseinstructions.Serial Number: ___ ___ ___ ___ ___ ___ ___ ___NOTE: If you have previously registered a Garmin productpurchase, we invite you to re-register using our online system.Many services provided by our product registration system arenow automated and re-registering your purchase ensures you thebest possible support from Garmin.INTRODUCTIONFishfinder 250/250C Owner’s Manual iii