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The magnetic variation…

  • A
    is caused by the different locations of the geographic North Pole and the magnetic North Pole.
  • B
    varies inversely with the bank angle of the aircraft.
  • C
    is caused by the inclination of the Earth`s magnetic field lines.
  • D
    varies proportionally with the bank angle of the aircraft.

Refer to figure.
As you can see in the diagram, the angular difference between the True North (TN) and the Magnetic North (MN) is called the magnetic variation. Therefore, you will always need the variation to calculate the TN from the MN and vice versa.

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