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autopilot or plotter, are connected to the GPS
unit, they must be set to work with NMEA 0183
as well.
(Note: On some newer model Garmin GPS
receivers, you may set the interface to
“Garmin Bcn Rcvr”. There is also a scan option
which will automatically scan for a DGPS
frequency and bit rate. Please refer to your GPS
owner’s manual for using this function. If this
setting is used, you may skip step 4.)
4. From the Beacon Receiver Setup Page, enter the
“Tuned To:” frequency and the “Bit Rate” for the
nearest DGPS beacon transmitter. (Refer to the
Beacon Reference Card for this information.)
5. Once the frequency and bit rate have been en-
tered, “Tuning” will be displayed at the bottom
of the page.
6. If the beacon signal is received by the GBR 21,
the “SNR” field will display a signal-to-noise ratio
and “Receiving” will appear at the bottom of the
page. The SNR scale ranges from zero (no recept-
ion) to 30 (best reception). The LED status light
on the receiver will change from flashing to
constantly on, indicating the signal is being
received.
If the beacon signal is received, but no DGPS
correction data is included, the message “No
Data” will appear at the bottom of the page. The
LED status light on the receiver will continue to
flash.
If no beacon signal is received, the “SNR” field
will remain blank, “No Status” will appear at the
bottom of the page, and the LED status light will
continue to flash.
7. To select another beacon transmitter, enter a new
frequency and bit rate.
8. Some Garmin units have a list of the last five
beacon frequencies used on the Beacon Log
Page. As an alternative to reentering frequency
and bit rate information each time you use the
GBR 21, you may select a beacon from this list.
(NOTE: The Beacon Receiver Setup Page will
Operation
Using the
GBR 21
The Main Menu Page on the
GPSMAP 130/135/175/
180/185/230/235. Select
‘Input/Output’ to make the
desired interface settings.
From the Input/Output
Settings Page, select ‘RTCM
In/NMEA Out’ to properly
interface with the GBR 21.