44 ST4000 Plus Wheel & Tiller Autopilots Owner’s Handbook
Aut oTack angle
The AutoTack angle is the angle through which the vessel will turn
when automatic tack is selected (see Chapter 2). The value must be
within the range 40 to 125∞, and can be adjusted in 1∞ steps.
Aut ot rim
The AutoTrim level setting determines the rate at which the autopilot
applies ìstanding helmî to correct for trim changes caused by varying
wind loads on the sails or superstructure. The settings are:
Set t i ng Ef f e ct Recommended f or:
Of f No t r i m co r r e ct i o n
1Slow trim correctionHeavy displacement vessels, with
full keel or transom rudder.
2Medium trim correctionHeavy displacement vessels.
3Fast trim correctionModerate to light displacement vessels.
4Super fast correctionPlaning power vessels
The default setting (Level 3) should provide optimum performance
with the ST4000 Plus autopilot. However, depending on the vesselís
dynamic stability, an incorrect rate of trim application may result in
poor course keeping due to autopilot instability. After gaining
experience with the ST4000 Plus, you may wish to change the setting.
The effect of the setting must be evaluated while under sail.
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