VOR/NDB Variation RNAV

Variation is applied "where the work is being done":

  • For an NDBNDB —Non-Directional Beacon, the calculation of bearing is done by the ADFADF —Automatic Direction Finder, in the aircraft.
  • For a VORVOR —VHF Omnidirectional Range, the phase difference is applied at the beacon.

You therefore use the variations at these respective places.

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An RMIRMI —Radio Magnetic Indicator indicates an aircraft\'s heading, and the bearing of the navigational aids NDBNDB —Non-Directional Beacon and VORVOR —VHF Omnidirectional Range. Which variations should be applied to convert these bearings to true?