• 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 276C using the COM 1 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 field, and press ENTER.
3. Highlight Scan, and press ENTER. The numbers in the
Frequency field change as the unit scans from 284 kHz to
325 kHz, 200 bit rate, then 100, at 6-second intervals.
The Status field shows one of the following:
• Tuning—the unit is attempting to tune to the specified
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.
COM 1 sub tab with GARMIN DGPS selected
Status of the
scan
To restart the scan:
1. Press MENU.
2. Highlight Restart Scan, and press ENTER.
To manually enter a frequency and bit rate:
1. With the unit set to GARMIN DGPS or RTCM In/NMEA Out,
use the ROCKER to highlight the Beacon field, and press
ENTER.
2. Highlight User, and press ENTER.
3. Highlight the Frequency or Bit Rate field, and press ENTER
4. Enter a frequency or bit rate. Press ENTER when finished.
GPSMAP 276C Owner’s Manual 87
MAIN MENU > SETUP TAB
