Interface Sub Tab with Garmin DGPS Selected
Highlight
Scan
and press
ENTER
.
Shows the
status of the
scan
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.
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
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
When the unit is receiving a DGPS signal, the Signal to Noise Ratio
(SNR) and Distance fields show data. The SNR range is 0 dB to 30
dB, with 30 being the best. The Distance field 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 find the most updated list of frequencies
and coverage areas, contact your local USCG or see their Web site at
.
GPSMAP 378/478 Owner’s Manual
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