13 / 20
You are on a magnetic heading of 055° and your ADF indicates a relative bearing of 325°. The QDM is:
  • A
    200°
  • B
    020°
  • C
    235°
  • D
    055°

Refer to figure.

Q-codes used in Navigation:

  • QDM = Magnetic bearing TO a station

  • QDR = Magnetic bearing FROM a station

  • QUJ = True bearing TO a station

  • QTE = True bearing FROM a station

A relative bearing is a bearing measured with respect to the nose of the aircraft, or to the aircraft heading. Relative Bearing (RB) can be converted into Magnetic Bearing (MB) using the formula: MB = RB + MH.

  • MB = 055° + 325°

  • MB = 380°

Obviously a value of 380° is a nonsense, therefore we deduct 360° to obtain a value of 020° = QDM = MB to the station.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.