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At a specific location, the value of magnetic variation…

  • A
    depends on the type of compass installed.
  • B
    depends on the true heading.
  • C
    varies slowly over time.
  • D
    depends on the magnetic heading.

The value of variation at any point on the Earth changes over a period of time.The reason for the change is that the position of the Magnetic North Pole is moving westwards round on the North Pole.

The movement having a west tendency doesn’t mean that the variation will directly increase over a period of time for a specific point, it can decrease as well.The movement of the Magnetic North are associated with the movement of the molten magma in the Earth’s core.

LO 061.01.03.01.05: Explain changes of variation with time and position.

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