gyrocompass

n. navigational compass containing a gyroscope which points in the direction of true north

A gyrocompass is a compass that finds true north by using an (electrically powered) fast-spinning wheel and friction forces in order to exploit the rotation of the Earth. Gyrocompasses are widely used on ships. They have two main advantages over magnetic compasses:they find true north, i.e., the direction of Earth's rotational axis, as opposed to magnetic north,they are not affected by ferrous metal in a ship's hull. (No compass is affected by nonferrous metal, although a magnetic compass will be affected by copper wires with current running through them.
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Noun
1. a compass that does not depend on magnetism but uses a gyroscope instead
(hypernym) compass
(part-meronym) gyroscope, gyro

n. gyrocompass, navigational compass containing a gyroscope which points in the direction of true north

gyrocompass
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