TMQ AP4 - Installing a Magnetic Sensor Unit (Fluxgate Compass)

TMQ AP4 Autopilot (AP4S10) 25 of 62 Version 4.96 9/10/2017
Installing a Magnetic Sensor Unit (Fluxgate / COMMAG)
Where there is magnetic interference on a vessel, the magnetic sensor unit may
have to be tried in several positions to obtain the best operating results before
final installation. Good autopilot course holding is dependent upon the
compass being free from magnetic interference
Exercise care when handling the compass as internal gimbals may be damaged
from abuse. Remove internal packing prior to installing.
Position
 Determine a suitable position free of magnetic influence
 Ensure there are no radios or radio aerials or cables nearby
 Check other side of bulkheads or behind dashes for any likely
interference
 Install compass bracket vertically (on bulkhead, dash or deck head)
 Carefully remove internal transit packing from compass
 Insert compass body into bracket
 Rotate compass in bracket until cable faces towards the stern
 Route the cable to the AP4 Control unit position
 Plug compass cable into AP4 autopilot
 Check AP4 display reads the same as the boat compass when pilot is
switched on.
Note: The compass can be mounted outside the hull of the boat if required (eg:
on a mast of a yacht). However, places to be avoided are low in the hull
near an engine or machinery because of magnetic interference or too
high up a mast because of excessive movement. The bracket can be fixed
from the top, side, or its bottom.