If you select GARMIN DGPS or RTCM In/NMEA Out format,you can control a differential beacon receiver directly fromyour GPSMAP 276C using the COM tab. You can have the unitautomatically scan for the DGPS beacon signal, or you can enter thebeacon frequency and bit rate on the unit, and the information willbe 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 theFrequency field change as the unit scans from 284 kHz to325 kHz, 200 bit rate, then 100, at 6-second intervals.COM 1 tab of the Setup tab with GARMIN DGPS selectedHighlightScan and pressENTER.Displays thestatus of thescanThe Status field displays one of the following:• Tuning—the unit is attempting to tune to the specifiedfrequency and bit rate.• Scanning—the unit is automatically scanning through thefrequencies and bit rates.• Receiving—the unit is receiving DGPS signal and ready foroperation.• Check Wiring—the unit is not making connection withDGPS receiver.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 key to highlight the Beacon field and pressENTER.2. Highlight User and press ENTER.3. Highlight the Frequency or Bit Rate field, press ENTER, andenter a frequency or bit rate. Press ENTER when done.GPSMAP 276C Owner’s Manual 89C USTOMIZING YOUR GPSMAP 276C > C HANGING THE DATA FORMAT
