Simrad AP21 and AP22 Autopilots
106 20220596G
• Too much Rudder gives unstable steering and reduces speed.
• Low speed requires more rudder than high speed.
Counter Rudder is the parameter that counteracts the effect of
the boats turn rate and inertia. For a short time period it is
superimposed on the normal rudder response as provided by the
Rudder parameter. It may sometimes appear as if it tends to make
the rudder move to the wrong side (counter rudder).
The best way of checking the value of the Counter Rudder
setting is when making turns. The figures illustrate the effects off
various Counter Rudder settings.
Autotrim standard value is 40 sec. which should work well on
most boats.
Rudder Limit should be kept at 20 degrees unless there is a
need for more rudder when performing dockside manoeuvres.
Note ! In no event should the Rudder Limit be set to a value higher than
the actual maximum rudder angle.
Exit the Parameter menu by pressing STBD [>] button to proceed
to the Display Units menu, or press STBY to return to normal
autopilot operation.
ew course
ew course
Counter rudder setting too
low, overshoot response
Correct setting of counter
rudder, ideal response
ew course
Counter rudder setting too high,
sluggish and creeping response
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