28 ST4000 Plus Wheel & Tiller Autopilots Owner’s Handbook
Drive stopped
DRI VESTOP
This alarm is activated if the autopilot is unable to turn the rudder. This
occurs if the weather load on helm is too high, or if the requested rudder
position is past the pre-set rudder limits or the rudder end-stops.
Dat a not received
NO DATA
This alarm is displayed in the following circumstances:
ïTrack mode is engaged and the vessel arrives at the last waypoint in
the track
ïTrack mode is engaged and the autopilot is not receiving SeaTalk
navigation data
ïTrack mode is engaged and the position transducer (GPS, Loran,
Decca) is receiving a low strength signal ñ this will clear as soon as
the signal strength improves
ïVane mode is engaged and the autopilot has not received wind angle
data for 30 seconds
The autopilot stops adjusting the heading as soon as data is lost.
Waypoint advance
NEXT WPT?
The Waypoint Advance alarm sounds whenever the target waypoint
number changes, which occurs in the following circumstances:
ïAutomatic acquisition is selected by pressing track from Auto
ïWaypoint advance is requested by pressing track for 1 second in
Track mode (SeaTalk navigators only)
ïThe target waypoint changes when in Track mode (for example,
when a Man Overboard (MOB) message has been received)
When the alarm sounds, the pilot continues on its current heading, but
displays the bearing to the next waypoint and the direction in which the
boat will turn to take up that bearing.
Check that it is safe to turn onto the new track, and press track to
accept the waypoint advance.
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