Chap t e r 5 : Cu st o m i s i ng t he ST40 00 Pl us
45
ïDecrease the AutoTrim level if the autopilot gives unstable course
keeping or excessive drive activity with a change in the heel angle.
ïIncrease the AutoTrim level if the autopilot reacts slowly to a
heading change due to a change in the heel angle.
ïFor systems without a rudder reference unit, these settings have no
effect and the trim is set to Level 3.
Drive t ype
The drive type controls the way which the autopilot drives the steering
system. The default setting (soft drive) should be retained for
mechanically driven vessels.
Variat ion
If required, set this value to the level of magnetic variation present at
your vesselís current position. +ve variation = East, -ve variation =
West. The variation setting is sent to other instruments on the SeaTalk
system, and can be updated by other SeaTalk instruments.
Aut oAdapt
The patented AutoAdapt feature allows the ST4000 Plus to
compensate for heading errors at higher latitudes, which are caused by
the increasing dip of the earthís magnetic field. The increased dip has
the effect of amplifying rudder response on northerly headings in the
northern hemisphere, and on southerly headings in the southern
hemisphere.
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