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What does QDM mean?
  • A
    True heading to the station (no wind).
  • B
    Magnetic heading to the station (no wind).
  • C
    True bearing from the station.
  • D
    Magnetic bearing from the station.

Refer to figure.
As seen in the figure there is a system of abbreviations that indicates what kind of bearing is described.

  • QDM = Magnetic bearing to the station
    QDR = Magnetic bearing from the station
    QUJ = True bearing to the station
    QTE = True bearing from the station
Note: ICAO officially defines QDM/QDR = magnetic heading (zero wind).

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