IntroductionPreface/Registration/Software License AgreementPrefaceCongratulations on choosing one of the most advanced marine navigation systems available! TheGarmin GPSMAP 178/178C Sounder utilizes the proven performance of Garmin GPS and full-featured map-ping to create an unsurpassed marine navigation chartplotter.To get the most out of your new navigation system, take the time to go through this owner’s manual andlearn the operating procedures for your unit. This manual is broken into two parts for your convenience.Part One introduces you to the GPSMAP 178/178C Sounder and provides a Getting Started tour so thatyou may become more familiar with the unit. This section provides you with a basic knowledge necessary touse the unit.Part Two is divided into sections that provide detailed references to the advanced features and opera-tions of the GPSMAP 178/178C Sounder. This allows you to concentrate on a specific topic quickly and lookup detailed information about the GPSMAP 178/178C Sounder.Product Support Product RegistrationHelp us better support you by completing our onlineregistration today! Connect to our Web site atwww.garmin.com/registration/.Use this area to record the serial number (8-digitnumber located on the back of the product name) incase your product name needs service. Keep the originalsales receipt, or a photocopy, in a safe place.Serial Number:___ ___ ___ ___ ___ ___ ___ __Contact GarminContact Garmin if you have any questions whileusing your product name. In the USA contact GarminProduct Support by phone: (913) 397-8200 or (800)800-1020, Monday–Friday, 8 AM–5 PM Central Time;or go to www.garmin.com/support/, and clickProduct Support.In Europe, contact Garmin (Europe) Ltd. at+44 (0) 870.8501241 (outside the UK) or0808 2380000 (within the UK).Software License AgreementBY USING THE GPSMAP 172/172C, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONSOF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CARE-FULLY.Garmin grants you a limited license to use the software embedded in this device (the “Software”) inbinary executable form in the normal operation of the product. Title, ownership rights and intellectualproperty rights in and to the Software remain in Garmin.You acknowledge that the Software is the property of Garmin and is protected under the United Statesof America copyright laws and international copyright treaties. You further acknowledge that the structure,organization, and code of the Software are valuable trade secrets of Garmin and that the Software in sourcecode form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble, modify,reverse assemble, reverse engineer, or reduce to human readable form the Software or any part thereof orcreate any derivative works based on the Software. You agree not to export or re-export the Software to anycountry in violation of the export control laws of the United States of America..