16 ST6000 Plus Autopilot Control Unit Owner,s Handbook
Cross track error
Cross track error (XTE) is the distance between the current position
and a planned route. This is displayed in nautical miles (nm), statute
miles (SM) or kilometres, and is taken directly from your navigator.
The Large XTE alarm sounds if the XTE exceeds 0.3nm.
The direction of the error is identified as Pt port or Stb
starboard.
To cancel the alarm and leave track mode, press standby to return
to hand steering, or auto to return to Auto mode.
Note: If the Large Cross Track Error alarm sounds, it is usually an
indication that the cross tide is too great for the vessels current speed.
Tidal stream compensation
Under most conditions, Track mode will hold the selected track to
within ±0.05nm (300ft) or better. The autopilot takes account of
vessel speed when computing course changes to ensure optimum
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