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Display Tab............................................................................. 79
Sound Tab .............................................................................. 80
Setup Tab ............................................................................... 81
Setting Up and Using Sonar .............................................90
Showing Sonar on the Map Page ......................................... 90
Using the Sonar Page ........................................................... 91
Setting Up Sonar ................................................................... 95
Understanding Sonar ............................................................ 99
Appendix ..........................................................................102
Specications ...................................................................... 102
Optional Accessories .......................................................... 103
Installation Information ....................................................... 104
What is EGNOS/WAAS/MSAS? .......................................... 109
LORAN TD Setup ................................................................. 109
Map Datums and Location Formats ...................................111
Digital Selective Calling (DSC) ........................................... 112
Declaration of Conformity (DoC) ....................................... 117
Messages ............................................................................. 118
Data Field Options ............................................................... 120
Software License Agreement ............................................. 122
Product Registration ........................................................... 122
Limited Warranty ................................................................. 123
FCC Compliance .................................................................. 124
Index .................................................................................125
GPSMAP 278 Owner’s Manual iii
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