TMQ Bosun-AP9, Operation And Installation Manual

Page: 23 / 63

TMQ Bosun - AP9 Rev1 (935) Page 23 16/06/2003
Magnetic Effect
As a minimum amount of steel is used in the control unit, there is
negligible effect on a steering compass. Some radio interference may be
caused and the routing of cables should be considered when wiring the
vessel.
Checking
Always check the installation before going to sea to make sure that it is not
affected by radio transmissions, engine starting, low battery voltage or
other problems.
In some installations it may not be possible to prevent the equipment from
being affected by external influences. Usually this will not damage the
equipment but may lead to resetting or momentary incorrect operation.
Compass Installation
There are two types of compass suitable for this autopilot - a magnetic
sensor unit (fluxgate)(COMMAG), which is a complete compass, and the
compass-top sensor (CTS), which is used together with a standard flat-
topped magnetic ships compass.
Installing a Compass-Top Sensor
The sensor unit is placed on the glass plate of the ships compass, in the
exact centre of the compass card and secured with double-sided tape.
Before fixing the sensor in place, align it carefully so that the
Bosun
compass displays the same bearing as the ships compass. The compass top