V103/113 Vector User Guide Appendix A- Troubleshooting
Page A3
Table A-1 Troubleshooting (continued)
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 V103/113 should be directed to the
bow side
$JATT,SEARCH command forces the V103/113 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 within
PocketMax3—at least four satellites should have strong SNR values
Potentially, the volume of data requested to be output by the V103/113 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
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