26
Course as set on Autopilot
instrument is different from
ship’s steering compass.
If constant error, Autopilot
compass is not aligned with
for-aft line of boat.
Use Compass setting [C6] [ADJ] to adjust align-
ment of compass.
Variable error in heading
caused by magnetic interfer-
ence.
Verify that the steering compass is accurately cor-
rected and then correct the Autopilot compass as
per installation instructions.
Large errors not corrected by
above remedies or lack of
change in course set point
with different headings indi-
cate a defective compass.
1.
Run Auto-Deviation-Clear [C5] [CLR].
2.
Run Auto-Deviation [C3] [DEV]
3.
Recheck compass again.
Ships compass is not cor-
rect.
Compensate ships compass.
Compass: no reading or
wrong heading.
Check that the local magnetic variation [C2] [VAR]
is set properly.
Irregular values.
Check the Sea Damping [P2] [SEA].
NMEA does not engage,
NAV arrow does not come
on.
NMEA receiver not installed
correctly.
Check receiver settings for proper output.
No NMEA 0183 data re-
ceived.
Check Nav cable for connection. to the correct
port.
Unreliable NMEA data de-
tected upon engagement.
Check connections and setup in transmitting in-
strument
No active waypoint.
Activate a waypoint.
After some use, NAV
arrow does not come on.
Poor NMEA data detected.
Last "good" NMEA heading
is used until good data re-
stored.
Check for poor navigator installation causing bad
signal to noise ration. Check for erroneous data as
detected by navigator. Revert to magnetic course
only, if situation cannot be corrected.
Course under NAV steering
is erratic.
May appear when close to
waypoint due to GPS-S/A.
error.
Accept situation or revert to compass course
steering only.
Compass heading informa-
tion is not consistent with
navigator.
Set heading in pilot i.e. true to true or magnetic to
magnetic so course is consistent with navigator.
Check NMEA wiring termination.
FAULT FINDING