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269 - ATPL Question Bank in English - For an RNAV straight great-circle leg between two active waypoints, what does cross-track deviation (XTK) represent?

Question 269 - Radio Navigation - ATPL - Airline Transport Pilot Licence

The shortest lateral distance between the aircraft’s actual position and the reference great-circle track of that leg.
The wind-uncorrected dead-reckoning air position’s distance from the reference leg.
The commanded aircraft heading measured from magnetic north.
The distance already travelled along the leg between the waypoints.

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