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Chapter 2: Basic Operation 15
2 Basic Operation
Wind Shift alarm (WINDSHIFT)
The ST4000+ activates the Windshift alarm when it detects a change
in the apparent wind angle of more than 15° (see page 29).
Large Cross Track Error alarm (LARGE XTE)
The ST4000+ activates this alarm when the cross track error exceeds
0.3 nm (see page 22).The alarm clears if the heading recovers, if you
change the course, or if you change the operating mode.
Drive Stopped alarm (DRIVESTOP)
The ST4000+ activates this alarm if:
• the rudder position sensor fails, or
• the autopilot is unable to turn the rudder (this occurs if the weather
load on helm is too high, or if the rudder position sensor has
passed beyond the preset rudder limits or rudder end-stops)
Data Not Received alarm (NO DATA)
The ST4000+ activates this alarm in any of the following situations:
• the compass is not connected
• the autopilot is in Wind Vane mode and it has not received wind
angle data for 30 seconds
• the autopilot is in Track mode and:
• the boat has arrived at the last waypoint in the track, or
• the autopilot is not receiving SeaTalk navigation data, or
• the position sensor (GPS, Loran, Decca) is receiving a low
strength signal – this will clear as soon as the signal strength
improves
The autopilot stops adjusting the heading as soon as it loses data.
Waypoint Advance alarm (NEXT WPT?)
The ST4000+ activates the Waypoint Advance alarm whenever the
target waypoint number changes. This occurs when:
• you select automatic acquisition by pressing
track from Auto
• you request waypoint advance by pressing
track for 1 second in
Track mode (with SeaTalk navigators only)