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Message Tab .......................................................................... 83
Display Tab............................................................................. 84
Sound Tab .............................................................................. 85
Setup Tab ............................................................................... 86
Using XM WX Weather ......................................................95
Viewing XM WX Weather ....................................................... 95
Setting XM WX Weather Options ......................................... 95
Using the Weather Tab .......................................................... 98
Finding Weather Information.............................................. 101
Setting Up and Using Sonar ...........................................103
Showing Sonar on the Map Page ....................................... 103
Using the Sonar Page ......................................................... 104
Setting Up Sonar ................................................................. 108
Understanding Sonar .......................................................... 112
Appendix ..........................................................................115
Specications ...................................................................... 115
Optional Accessories .......................................................... 116
Installation Information ....................................................... 117
Satellite Information ............................................................ 122
What is Differential GPS (DGPS)? ..................................... 122
LORAN TD Setup ................................................................. 124
Map Datums and Location Formats .................................. 126
Digital Selective Calling (DSC) ........................................... 127
Messages ............................................................................. 129
Data Field Options ............................................................... 131
Software License Agreement ............................................. 133
Product Registration ........................................................... 133
Limited Warranty ................................................................. 134
Weather Data Warranty ....................................................... 135
XM Satellite Radio Service Agreement .............................. 136
FCC Compliance .................................................................. 137
Index .................................................................................138
GPSMAP 378/478 Owner’s Manual iii
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