Pages Tab ............................................................................... 63
Map Tab .................................................................................. 64
General Sub Tab ........................................................................... 64
Source Sub Tab ............................................................................ 64
Waypoints Sub Tab ....................................................................... 65
Points Sub Tab .............................................................................. 66
Navaids Sub Tab ........................................................................... 66
Nav Line Sub Tab ......................................................................... 67
Track Sub Tab ............................................................................... 67
Other Sub Tab ............................................................................... 67
Sonar Tab ............................................................................... 68
Units Tab ............................................................................... 70
Alarm Tab ............................................................................... 76
Using Sonar .......................................................................78
Sonar Page ............................................................................. 78
Sonar Page Options ...................................................................... 83
Sonar Tab Options ................................................................ 85
GPSMAP 188/188C Sounder Owner's Manual
Whiteline ...................................................................................... 91
Thermoclines ................................................................................ 91
Appendix ............................................................................92
Specifications ........................................................................ 92
Interfacing .............................................................................. 99
What is WAAS? .................................................................... 102
Navigation Terms ................................................................ 104
Messages ............................................................................. 106
LORAN TD System .............................................................. 108
Limited Warranty ................................................................. 112
FCC Compliance .................................................................. 113
Index .................................................................................115
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