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6
ST80 Autopilot Keypad Operation Manual
Track Advance/Acceptance
If your navigation receiver is transmitting waypoint number and
bearing to waypoint, a waypoint alarm will sound whenever a new
target waypoint is selected. The autopilot maintains the current
heading and automatic track control is suspended. Check the new
bearing to waypoint, make sure that it is safe to turn, and then return
to automatic track control by simply pressing the track key. The new
target waypoint is accepted and the autopilot steers your vessel onto
the new heading.
You may find that the tidal offset is very different on the new bearing.
Therefore, it is advisable to check the cross track error (XTE) after a
couple of minutes. If the cross track error increases, make a course
adjustment (e.g., 10°) in the direction of the arrow. This helps to
speed up track control correction for the new tidal vector.
Response
There are three response levels.
Level 1 is the default and suitable for most situations. This setting
provides the best compromise between course-keeping accuracy and
power consumption.
Level 2 ensures tighter course-keeping at the expense of increased
power consumption and wear and tear due to increased pilot activity.
It is advisable to use the minimum response necessary to achieve the
desired course keeping accuracy.
On larger vessels, level 3 can improve slow speed steering where
natural yaw damping of the vessel is reduced.
Note: Level 3 is not recommended for use at planing speeds, or in rough
seas if a rate gyro transducer is not fitted.
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