Message Tab ..........................................................................83
Display Tab.............................................................................84
Sound Tab ..............................................................................85
Setup Tab ...............................................................................86
Using XM WX Weather ......................................................95Viewing XM WX Weather .......................................................95
Setting XM WX Weather Options .........................................95
Using the Weather Tab ..........................................................98
Finding Weather Information..............................................101
Setting Up and Using Sonar ...........................................103Showing Sonar on the Map Page .......................................103
Using the Sonar Page .........................................................104
Setting Up Sonar .................................................................108
Understanding Sonar ..........................................................112
Appendix ..........................................................................115Specications ......................................................................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 .................................................................................138GPSMAP 378/478 Owner’s Manual iii
IntroductIon > tAble of contents