Chapter 2: Autopilot Operation 8-2-15
ST290 Instrument System Owner’s Handbook
Figure 2-14: Large Cross Track Error
Tidal stream compensation
Undermost conditions,the autopilotwillhold theselected track to within
±0.05 nm (300 ft) or better. The autopilot takes account of the boat’s
speed when computing course changes to ensure optimum performance
over a wide range of boat speeds.
Figure 2-15: Tidal stream compensation
Waypoint 1
Waypoint 2
Cross track error (XTE)
more than 0.3 nm
D5415-2
Planned route
Actual route
Message will "pop-up" in front of current view
D3261-2
Waypoint 2
Waypoint 1
Tidal component
Boat's speed through water
Boat's speed over ground
81183_2 S8.book Page 15 Tuesday, May 6, 2003 9:08 AM
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