Points Tab .............................................................................. 70Track Tab ................................................................................ 71DSC Tab .................................................................................. 71Sonar Tab ............................................................................... 75Alarms Tab ............................................................................. 76Calendar Tab .......................................................................... 78Celestial Tab........................................................................... 79Message Tab .......................................................................... 83Display Tab............................................................................. 84Sound Tab .............................................................................. 85Using XM WX Weather ......................................................95Viewing XM WX Weather....................................................... 95Setting XM WX Weather Options ......................................... 95Using the Weather Tab .......................................................... 98Finding Weather Information.............................................. 101Setting Up and Using Sonar ...........................................103Showing Sonar on the Map Page ....................................... 103Using the Sonar Page ......................................................... 104Setting Up Sonar ................................................................. 108Understanding Sonar .......................................................... 112Appendix ..........................................................................115Specifications ...................................................................... 115Optional Accessories .......................................................... 116Installation Information ....................................................... 117Satellite Information ............................................................ 122What is Differential GPS (DGPS)? ..................................... 122LORAN TD Setup ................................................................. 124Map Datums and Location Formats .................................. 126Digital Selective Calling (DSC) ........................................... 127Messages ............................................................................. 129Data Field Options ............................................................... 131Software License Agreement ............................................. 133Product Registration ........................................................... 134FCC Compliance .................................................................. 134Limited Warranty ................................................................. 135Weather Data Warranty ....................................................... 136Index .................................................................................138GPSMAP 376C Owner’s Manual IntroductIon > tAble of contents