TMQ AP4 Autopilot (AP4S10) 26 of 62 Version 4.96 9/10/2017
Calibration
Only the Compass top sensor (CTS) or the COMMAG can be calibrated by the
AP4 control unit.
The compass is calibrated before leaving the factory and will be accurate if
there is no external magnetic interference. After initial sea trials, you may wish
to recalibrate the compass, although in most cases the factory calibration will be
as good as or better than calibration achieved on the vessel. See the Compass
Calibration Section.
Magnetic Sensor Unit & Compass Top Sensor Interchange
The magnetic sensor unit (fluxgate compass) can be interchanged with a
compass top sensor. This is desirable when the autopilot is to be fitted to a steel
hulled vessel or vessel containing large amounts of steel.
If the magnetic sensor unit and compass top sensor are interchanged, the
compass detector DIP switches must be altered. The top cover of the AP4 has to
be removed. The DIP switch is identified as component DIP2 on the PCB
component overlay diagram at the rear of this manual.
Selecting between fluxgate compass and compass top sensor:
Switch both sections of DIP2 to COMMAG for magnetic sensor unit
(fluxgate)
Switch both sections of DIP2 to CTS for compass top sensor
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