NorthStar EXPLORER AP380 Installation And Operation Manual page 72

Problem: after a sideways current or wind, the correction is applied too quickly or too slowly
If the boat encounters a sideways force, then it will move off course sideways. The AP380 will
automatically bring the boat back to the correct heading by applying a few degrees of rudder, called
trim. Trim gain sets how quickly the trim is applied. Trim gain should be adjusted to trim the boat in
about one minute. Getting the Trim gain setting right can be difficult for your specific boat and it is easy
to alter the Trim gain too much. Change the settings slowly and conservatively at first, until the right
settings are known.
a Boat takes much more than one minute to trim
Sideways force starts
1 minute
b Boat takes much less than one minute to trim
Sideways force starts
1 minute
Problem: drifts off GPS course
or
Problem: boat oscillated around GPS course
or
72
Northstar Explorer AP380 System Installation and Operation Manual
Increase trim gain
Decrease trim gain
Increase GPS gain.
Decrease GPS gain.