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Interface 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.
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,
highlight the Beacon eld, and press ENTER.
2. Highlight User, and press ENTER.
3. Highlight the Frequency or Bit Rate eld, and press ENTER.
4. Enter a frequency or bit rate. Press ENTER when nished
When the unit is receiving a DGPS signal, the Signal to Noise Ratio
(SNR) and Distance elds show data. The SNR range is 0 dB to 30
dB, with 30 being the best. The Distance eld might or might not
show data, depending on the signal being broadcast from the DGPS
site.
The DGPS beacon transmitters are operated by the United States
Coast Guard (or similar government agency in other countries),
which is responsible for their accuracy and maintenance. For DGPS
transmitter problems or to nd the most updated list of frequencies
and coverage areas, contact your local USCG or see their Web site at
www.navcen.uscg.mil/.
GPSMAP 378/478 Owner’s Manual 93
MAIn Menu > setuP tAb