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Troubleshooting | HS80/HS80A/MX575C/MX575D User Manual
Symptom Possible Solution
No heading or incorrect
heading value
• Check CSEP value is fairly constant without varying more
than 1 cm (0.39 in)—larger variations may indicate a
high multipath environment and require moving the
receiver location
• Heading is from primary GPS antenna to secondary GPS
antenna, so the arrow on the underside of the smart
GPS compass should be directed to the bow side
• $JATT,SEARCH command forces the smart GPS compass
to acquire a new heading solution (unless gyro is
enabled)
• Enable GYROAID to provide heading for up to three
minutes during GPS signal loss
• Enable TILTAID to reduce heading search times
• Monitor the number of satellites and SNR values for both
antennas using the CDU—at least four satellites should
have strong SNR values
• Potentially, the volume of data requested to be output
by the smart GPS compass could be higher than the
current baud rate supports (try using 19200 as the baud
rate for all devices or reduce the amount of data being
output)
No DGPS position in external
RTCM mode
• Verify the baud rate of the RTCM input port matches the
baud rate of the external source
• Verify the pinout between the RTCM source and the
RTCM input port (transmit from the source must go to
receive of the RTCM input port and grounds must be
connected)
• Ensure corrections are being transmitted to the correct
port—using the $JDIFF,PORTB command on Port A will
cause the receiver to expect the corrections to be input
through Port B
No Beacon lock (MX575C &
D only)
• Verify the MX575C/MX575D has no obstructions from
large metal objects and railings.
• Verify the Beacon status in the GPS6 screen of the CDU.
Select a known beacon station frequency using manual
mode.
¼ Note: Beacon lock is only possible if you are in areas
where the land-based beacons cover. There are many
areas of the world where beacon signal is not available.
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