Nav Change Limit; Rudder Play Compensation - Simrad AP25 Manual

Simrad AP25 Autopilot

NAV change limit

Rudder play compensation.

(Only applicable when configured for Virtual feedback)
Notes!
1. To obtain the best possible steering performance the said
2. If the autopilot performance is found satisfactory when the
A play in the steering gear will always reduce the steering
performance of the autopilot. The best result is obtained when
sloppy linkages are repaired and this is the recommended course
of action.
With a rudder feedback unit installed the effect of the rudder
Note !
play is significantly lessened.
When rudder play still exists and there is no feedback unit
installed, the autopilot will need some assistance from the
installer to compensate for this. The effect of the rudder play is
124
procedures must be performed in the following order:
- Perform an autotune at 6-8 knots in calm sea.
- If necessary fine tune the Counter Rudder parameter (see
page 126) at cruising speed (LO value) and at slow speed
(HI value)
- Use the response control to obtain the best possible course
keeping (page 56).
above has been completed, skip the following rudder play
compensation procedure. The rudder play compensation
procedure is only necessary if the steering gear is sloppy.
Using this procedure when not required may interfere with
the steering algorithms and result in poorer steering instead
of providing improvements.
In NAV mode, when the
required course change at the
approaching waypoint is
bigger than the set limit, you
are prompted to verify that the
upcoming course change is
acceptable. The limit can be
set to 10°, 20° or 30°.
Default: 10°
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