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Adjustment Options ................................................................ 93
Resizing the Split Screen .............................................................. 95
Using the Pointer on the Sonar Page ............................................ 95
Setting up the Sonar ............................................................. 96
Calibrating the Water Speed ......................................................... 97
Setting up the Sonar Display ........................................................ 98
Understanding Sonar ............................................................ 99
Understanding the Sonar Display ................................................. 99
Transducer Coverage .................................................................. 100
Whiteline .................................................................................... 101
Thermoclines .............................................................................. 101
Appendix ..........................................................................102
Specifications ...................................................................... 102
Physical Specifications ............................................................... 102
Power .......................................................................................... 102
Performance ................................................................................ 102
Accuracy ............................................................................... 102
Optional Accessories .......................................................... 103
Installation Information ....................................................... 104
Connecting the Power/Data Cable .............................................. 104
Connecting Your GPSMAP 276C to a Computer ....................... 105
Information about USB Drivers ............................................ 105
Using xImage for Customized Waypoint Icons .......................... 106
Installing and Removing Data Cards .......................................... 106
Interfacing ................................................................................... 107
Removing the Antenna ............................................................... 107
Learning about GPS ............................................................ 108
Common GPS Terms .................................................................. 108
What is Differential GPS (DGPS)? ............................................ 108
Differential Field ........................................................................ 108
What is WAAS? .......................................................................... 109
LORAN TD Setup ................................................................. 110
LORAN TD Feature ................................................................... 110
Using the LORAN TD Format ................................................... 110
Map Datums and Location Formats .................................. 112
What are a Map Datum and which should I use? ....................... 112
What is a Location Format and which should I use? .................. 112
Digital Selective Calling (DSC) ........................................... 113
What is a Maritime Mobile Service Identity (MMSI) number? . 113
How are MMSI assignments obtained? ...................................... 114
Non-Federal Users in the United States ............................... 114
Federal Users in the United States ....................................... 114
Users Outside the United States ............................................ 114
Users In Canada .................................................................... 114
How can Garmin help you with DSC? ....................................... 114
Messages ............................................................................. 115
Data Field Options ............................................................... 116
Safety and Product Information ......................................... 118
Index .................................................................................123
GPSMAP 276C Owner’s Manual v
INTRODUCTION > TABLE OF CONTENTS