56 ST1000 Plus & ST2000 Plus Tiller Pilots
5. Press standby and remove the pilot to return to hand steering.
5.3 Adjusting autopilot performance
The factory setting for rudder gain provides stable control for initial sea trials.
However, different boats can vary widely in their response to the helm and further
adjustment to the rudder gain may improve the autopilot’s steering
characteristics.
The following test will determine whether the rudder gain is set too high or too
low.
1. In clear water and with the autopilot in Auto mode, alter course to starboard
by 40° by pressing
+10 four times.
• At cruising speeds, a course change of 40° should result in a crisp turn fol-
lowed by an overshoot of no more than 5°.
If this occurs the rudder gain is set correctly.
• If rudder gain is too high, the 40° course change will result in a distinct
overshoot of more than 5° (A).
Correct this oversteer by reducing the rudder gain setting.
• If rudder gain is too low, the boat’s steering performance will be sluggish
– it will take a long time to make the 40° turn and there will be no over-
shoot (B).
Correct this understeer by increasing the rudder gain setting.
Port Starboard
oror
D3320-2
81130_5.book Page 56 Wednesday, June 15, 2005 3:48 PM
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