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7. 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.
If no beacon signal is received, the “SNR” field
will remain blank, “No Status” will appear at the
bottom of the page.
8. To select another beacon transmitter, enter a new
frequency and bit rate.
9. 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 23, you may select a beacon from this list.
(NOTE: The Beacon Receiver Setup Page will
automatically default to the last beacon
transmitter used each time the GPS unit is turned
on.)
10.Select the Satellite Status Page. A “D” will
appear at the bottom of the signal strength
bar for each satellite with a corresponding
differential correction or “3D Differential” will be
displayed at the top of the satellite page. This
page is useful for determining the quality of
differential coverage available. (Remember, the
more satellites with corresponding differential
corrections, the more accurate your position will
be.) Some models will show a distance from the
DGPS tranmsitter only if this information is
contained in the DGPS signal.
Operation
Using the
GBR 23
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 23.
Additional manual tuning for the GBR 23
If your GPS does not support a tuning interface for
the GBR 23 and you wish to manually tune it, transmit
the following tuning sentence, based on NMEA 0183
ASCII (pg. 19), through a PC terminal program or other
compatible source to the DATA IN of the GBR 23:
$PSLIB,<1>,<2><CR><LF>
<1> Beacon tune frequency 0.0 (Auto), 283.5-
325kHz in 0.5 kHz steps.
<2> Beacon bit rate 0 (Auto), 25, 50, 100, 200
<CR><LF> Carriage Return, Line Feed
Example: $PSLIB,305.0,200<CR><LF>
GBR 23 Manual.p65 5/23/00, 1:28 PM12