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Transport wander arises because

  • A.The magnetic variation changes along the route
  • B.The local vertical and meridian change
  • C.The gyro rotor slows during flight
  • D.Bearing friction increases with altitude

Answer: B

Flying east or west changes the local meridian, and flying north or south changes the local vertical, so a space-fixed axis appears to move relative to the aircraft. Like earth rate it is an apparent effect rather than a real wander of the axis.

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