Simrad Robertson AP9 Mk3, Instruction Manual, Page: 154 / 202

Robertson AP9 Mk3 Autopilot
5-64
20169223D
RFC35NS Fluxgate Compass calibration and
alignment
Calibration
The calibration of the heading sensor must be carried out during sea
trials at very low speed. The sea state must be calm.
1.
Switch on the autopilot by selecting HELMSMAN to provide
mains to the heading sensor.
2. Make two 360 degrees turns to starboard within 5 minutes. Make
sure the boat passes 3 times through
the North (see figure). Ensure smooth
and slow movements. A minimum of
roll and acceleration will give the best
result. When passing through north for
the 3
rd
time, the course display shows
045 for a short moment (less than a
second.)
3. The heading sensor is now calibrated.
You may now perform the autopilot
sea trial.
If you move your boat more than 15-20° north or south from the
latitude where the compass has been calibrated, the calibration
procedure should be repeated. Calibration data is stored in the
compass and will not be deleted until a new calibration is performed.
Alignment
The calibration procedure must have been carried out.
Autopilot to HELMSMAN-mode.
Steer the boat on a known heading. Slightly turn the heading sensor
until the correct heading readout is obtained on the autopilot display.
Fasten the tightening screws.