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The term “Magnetic Course” (MC) is defined as...

  • A

    the angle between the magnetic north and the course line.

  • B

    the angle between true north and the course line.

  • C

    the direction from an arbitrary point on Earth to the geographic North Pole.

  • D

    the direction from an arbitrary point on Earth to the magnetic North Pole.

Refer to figure.
The poles of the Earth's magnetic field are close to the geographic poles, which lie on the axis of the Earth's rotation, but not coincident, so that a compass pointing to magnetic north will not point exactly at the geographic north pole.

The angle between the true meridian and the magnetic meridian, or the difference between the true north and the magnetic north (also the angle between the magnetic course and true course), is called variation and varies between 180° and zero. And the angle between the magnetic north and the course line is called the Magnetic course.

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