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The FMS cross track (XTK) is:
  • A
    the abeam distance error, to the left or right from the desired flight plan leg to the aircraft position.
  • B
    the distance error between the FMS computed position and the GPS computed position.
  • C
    the angular distance error, to the left or right from the desired track (DT) to the aircraft track (TK).
  • D
    the distance error between the FMS computed position and the IRS computed position.

The FMS cross-track (XTK) error is the abeam distance error, either side of the desired flight plan leg. Sometimes you will be requested by ATC to turn to a certain heading for separation with other traffics, or you will make the request to avoid a CB. In any case, if you go off your flight plan route, the FMS will display you the XTK on the ND. This gives you a reference on how much you deviated from your route, so you will anticipate your interception accordingly.
 

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