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• Text Out—allows the unit to output simple text data that
includes data, time, location, and velocity. The Baud can be
set to 1200, 2400, 4800, or 9600.
•
None—provides no interfacing capabilities.
If you select GARMIN DGPS or RTCM In/NMEA Out format,
you can control a differential beacon receiver directly from your
GPSMAP 278 using the COM 1 or COM 2 sub tab. You can have
the unit automatically scan for the DGPS beacon signal, or you
can enter the beacon frequency and bit rate on the unit, and the
information will be used to tune the beacon receiver. If you use a
DGPS receiver, WAAS capability is automatically turned off.
To have the unit automatically scan for a frequency:
1. Set the unit to GARMIN DGPS or RTCM In/NMEA Out.
2. Highlight the Beacon eld, and press ENTER.
3. Highlight Scan, and press ENTER. The numbers in the
Frequency eld change as the unit scans from 284 kHz to
325 kHz, 200 bit rate, then 100, at 6-second intervals.
COM 1 Sub Tab with Garmin DGPS Selected
Highlight Scan
and press
ENTER.
Shows the
status of the
scan
The Status eld shows one of the following:
•
Tuning—the unit is attempting to tune to the specied
frequency and bit rate.
•
Scanning—the unit is automatically scanning through the
frequencies and bit rates.
•
Receiving—the unit is receiving DGPS signal and ready for
operation.
•
Check Wiring—the unit is not making connection with
DGPS receiver.
GPSMAP 278 Owner’s Manual 87
MAIn Menu > setuP tAb