High Quality Content by WIKIPEDIA articles! The Earth inductor compass is a device for determining aircraft direction using the magnetic field of the Earth. The operation of the compass is based on the principle of electromagnetic induction with the Earth's magnetic field acting as the induction field for an electric generator. Because the direction of the Earth's magnetic field is aligned nearly north south, the electrical output of the generator will vary depending on its orientation with respect to the Earth's magnetic field. This variation in the generated voltage is measured, allowing the Earth inductor compass to determine direction.

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