Customizing Your Device Interface —sets the format of the serial interface: Colors —sets the colors used on the device screens. Main, Setup, Find Style —allows you to select how the main menu, setup menu, and search menu appear. Screen Capture —allows you to take screen captures on the device. Garmin Serial —Garmin proprietary format used to provide PVT protocol data. NMEA In/Out —provides standard NMEA 0183 output and input. Text Out —provides simple ASCII text output of location and velocity information.
RTCM Radio Technical Commission for Maritime Services—allows the device to accept DGPS Differential Global Positioning System information from a device supplying RTCM data in an SC-104 format. Setting Up Tones Your Garmin device allows you to customize the key tones, message beeps, or turn off tones. From the main menu, select Setup > Tones . Marine Settings From the main menu, select Setup > Marine . Marine Chart Mode —allows you to select a nautical chart or a fishing chart: Display Settings From the main menu, select Setup > Display . Backlight Timeout —see page 33 . Battery Save —see page 33 .
Nautical —displays various map features in different colors so that the marine POIs are more readable. The nautical chart 24 GPSMAP 78 Series Owner’s Manual