Chapter 3: Operating instructions
27
Cross track error
Cross track error (XTE) is the distance between the current position and a planned
track leg.
There are a number of reasons why you may have a cross track error (XTE), for
example:
•
Pressing the track button at a position some distance from the route.
•
Course change to avoid an obstacle.
•
Waypoint arrival under certain conditions (See
Waypoint arrival
on
page 28
)
If the cross track error is greater than 0.3 nm, the SmartPilot will sound the Large
Cross Track Error warning and show whether you are to the port (Pt) or starboard
(Stb) of the planned track.
Note:
The cross track error alarm will continue to display and sound until it is reduced to less
than 0.3Nm.
CAUTION: When returning to TRACK mode the autopilot will
correct the XTE in order to keep to the defined track leg. The
direction of turn may not coincide with the bearing to waypoint
and may be different from that expected.
Cross
track error
Cross
track error
Target
Waypoint
Target
Waypoint
Example1:
Initial turn toward waypoint
Example2:
Initial turn away from actual
waypoint position.
D10917-1
Course correction
Summary of Contents for ST70 Instrument
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