TMQ Bosun-AP9, Operation And Installation Manual

Page: 19 / 63

TMQ Bosun - AP9 Rev1 (935) Page 19 16/06/2003
Trim
When the Bosun is first switched on and in Standby
mode, the Trim knob should initially be set in mid
position, which corresponds to a setting of 5 .
There are circumstances in which the autopilot may set
the rudder in the centre (according to its feedback unit),
but the vessel does not steer straight ahead. Reasons for
this are:
1.
The rudder feedback unit may not be perfectly aligned.
2. There may be a side-wind, current, net drag, etc., which causes the
vessel to steer to one side.
To find the correct
trim setting:
With the vessel travelling ahead, switch the autopilot to power steer
mode. Adjust the trim control until the ship steers straight.
The trim control is
not intended to be used for adjusting the vessel course
in auto or power steer mode.