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1) “Check Wiring”
displayed on GPS unit
Power switch/wiring faulty.
Fuse/breaker blown (if used).
GBR 23 not wired properly with
GPS unit. Check wiring.
If the BROWN (Data In) wire is
not used (Auto-tuning), this
message may be displayed. If the
receiver status screen displays
the GPS is receiving differential
corrects, no action is needed.
Reference
Troubleshooting
Chart
The receiver status indication
at the top left of the Satellite
Status Page will indicate ‘3D
Diff’ or ‘2D Diff’ when
differential corrections are
available. A ‘D’ appears at
the bottom of the signal
strength bar for each satellite
with a corresponding
differential correction.
Intermittent connection between
GBR 23 and GPS unit. Check
wiring.
Interference from ship’s electrical
system, other electronic items,
thunderstorm activity, or
another source is preventing
signal lock-on.
Also refer to Troubleshooting
problems 5 and 6.
Beacon receiver is improperly
connected or baud rates do not
match.
Please refer to Troubleshooting
problems 5 and 6.
4) “RTCM Input
Failed” displayed on
GPS unit
3) “No RTCM Input”
displayed on GPS unit
2) “No DGPS Position”
displayed on GPS unit
Not enough data is available to
compute a DGPS position.
Please refer to Troubleshooting
problems 5 and 6.
Possible Cause
Problem
5) GPS interface
status screen displays
“No data” or “No
Signal”
Wrong frequency or bit rate
selected on GPS unit.
Beacon transmitter not
transmitting correction data.
GBR 23 Manual.p65
5/23/00, 1:28 PM
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