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Main Menu
‘COM 1’ and ‘COM 2’ tabs
The ‘COM 1’ and ‘COM 2’ tabs allow you to control the input/output format used when connecting
your unit to external devices, such as a NMEA device, a DGPS beacon receiver, a personal computer, or
another Garmin GPSMAP 276C. If a DGPS receiver is used, WAAS capability is automatically turned off.
To open the Com 1 or ‘COM 2’ tab, press the MENU key twice to open the Main Menu. Select ‘Setup’
from the vertical tab list. Then select ‘Com 1’ or ‘Com 2’ from the row of tabs along the top of the page.
Serial Data Format – sets the data format to one of the following:
• Garmin Data Transfer – the proprietary format used to upload/download MapSource data,
exchange waypoint, route, track, almanac, and proximity data with a PC or another Garmin
GPSMAP 276C. ‘Garmin Data Transfer’ is disabled when the USB is connected and the unit
automatically switches to USB format.
When the USB is disconnected, the ‘USB’ fi eld changes to ‘Transfer Mode’. There are 11 Transfer
Modes to choose from.
• GARMIN DGPS – used to connect the GPSMAP 276C with a Garmin DGPS beacon receiver.
• NMEA In/NMEA Out – supports the input/output of standard NMEA 0183 version 3.01 data,
and sonar NMEA input support for the DPT, MTW and VHW sentences.
• Text Out – allows the unit to output simple text data that includes, data, time, position and
velocity. The Baud can be set to 1200, 2400, 4800, or 9600.
• RTCM In – allows Differential GPS (DGPS) input using a standard RTCM format.
• RTCM In/NMEA Out – allows Differential GPS (DGPS) input using a standard RTCM format and
also provides NMEA 0183 version 3.01 output.
• RTCM In/Text Out – allows Differential GPS (DGPS) input using a standard RTCM format and
also outputs simple text data that includes, data, time, position and velocity.
• None – provides no interfacing capabilities.
Setup Tab
‘COM 1’ tab of the Setup Tab
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