Garmin GPS II Plus - Manual (Page 91)

When the GPS II + is receiving DGPS corrections from the GBR 21, the ‘beacon receiver’ sec-
tion of the I/O setup page will display the beacon frequency and signal strength, as well as the
distance from the transmitter to the beacon receiver. At the bottom of the beacon receiver field,
a status message will keep you informed of DGPS activity:
• A ‘tuning’ message will be displayed while a beacon signal is being tuned.
• Once the beacon signal has been tuned, a ‘receiving’ message will be displayed.
• If a beacon signal is tuned and no corrections are being received, a ‘no data’ message will
be displayed.
• If a beacon signal cannot be tuned, a ‘no status’ message will be displayed.
The message page will alert you to any problems relating to DGPS operation. You may also
monitor the DGPS status from the status field on the interface page. The GPSII+ will display
one of three alert messages concerning DGPS operation:
No DGPS Position— there is not enough data available to compute a DGPS position.
No RTCM Input— the beacon receiver is not properly connected or the baud rates do not
match.
RTCM Input Failed— DGPS data was being received but has been lost.
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