ComNav 1500 / 1510 Autopilot - 25 -
3.5 Automatic Trim [ATC] Function
Automatic Trim Adjustment is not critical. It constantly compares the course set
against the course steered. If a persistent error exists due to wind, waves or
unbalanced forces (such as a single screw operation of a twin screw vessel), or an
off-center tow or weather helm on a sailing vessel, the automatic trim slowly applies
more rudder as necessary to reduce the error to zero. If the trim time is set too
high, it will take a long time to eliminate the course error. If it is set too low it can
start to degrade course stability. In general, longer trim times (higher settings)
should be set for large vessels and sailing vessels and shorter trim times (lower
settings) for small vessels and high speed planning vessels. The factory default
setting should be acceptable for all but extreme applications.
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