TMQ Bosun-AP9, Operation And Installation Manual

Page: 16 / 63

TMQ Bosun - AP9 Rev1 (935) Page 16 16/06/2003
Controls
Rate-of-Turn Control
This knob sets the rate-of-turn for the vessel, to prevent
very sharp turns when changing course.
Fully anticlockwise will turn 1 degree/sec (i.e. 180
degrees in 3 minutes). Fully clockwise will turn 40
degrees per second (i.e. as fast as possible for most
vessels).
The slower settings may be used for turns while trawling, trolling, etc., and
the Mid-range settings used to prevent dangerous or uncomfortably sharp
turns.
Note that the turn rate of a vessel will also depend upon the rudder ratio
setting, and perhaps the rudder limits.
If a course change is entered, and then it is realised that the rate-of-turn
control is set too low (i.e. the turn is too slow) just alter the rate-of-turn
control clockwise until the correct speed is found.
Once a turn is begun, adjusting the rate-of-turn control downward (anti-
clockwise) will have no effect. i.e., the turn rate can be INCREASED
during a turn, but not DECREASED.
The rate-of-turn control applies only in AUTO and GPS modes.
Rate of turn is also controlled by the rudder limit and rudder ratio controls.
A course-change entered from one of the remote steering stations is not
controlled by the rate-of-turn knob.