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76 GPSMAP 176/176C Owner’s Manual
MAIN MENU > SETUP TAB
If you select Garmin DGPS or RTCM In/NMEA Out,
additional data fields are provided allowing you to control
the frequency and bit rate that the DGPS receiver uses.
To manually enter a frequency and bit rate:
1. With the unit set to Garmin DGPS or RTCM In/NMEA Out,
use ROCKER to highlight the Beacon field and press ENTER.
2. Highlight User and press ENTER.
3. Highlight the Frequency or Bit Rate field, press ENTER, then
enter a frequency or bit rate. Press ENTER when done.
The Status field shows one of the following:
• Tuning—unit is attempting to tune to the specified frequency
and bit rate.
• Scanning—unit is automatically scanning through the
frequencies and bit rates.
• Receiving—unit is receiving DGPS signal and ready for
operation.
• Check Wiring—unit is not making connection with the DGPS
receiver.
When the unit is receiving a DGPS signal, the “SNR” (Signal to
Noise Ratio) and Distance fields show data. The SNR range is 0 dB
to 30 dB, with 30 being the best. The distance may or may not show
data, depending upon the signal being broadcast from the DGPS site.
The DGPS beacon transmitters are operated by the U.S. Coast
Guard (or similar government agency in other countries), which
is responsible for their accuracy and maintenance. For DGPS
transmitter problems or to find the most updated list of frequencies
and coverage areas, contact your local USCG, or visit their Web site
at http://www.navcen.uscg.mil/.