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How does a gyrocompass compare with a gyromagnetic compass?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
gyrocompass
gyrocompass The gyrocompass aboard the National Oceanic and Atmospheric Administration's (NOAA) ship Rainier. Gyrocompasses are navigational instruments that use a continuously driven gyroscope to accurately seek the direction of true (geographic) north.

A gyrocompass and a gyromagnetic compass are distinct navigational instruments that utilize gyroscopic principles in different ways.

  • Gyrocompass: This device uses a continuously driven gyroscope combined with gravity and the Earth's rotation to seek true (geographic) north. Because it is independent of the Earth's magnetic field, it is immune to magnetic interference from steel structures, ore deposits, or electric circuits. It is widely used on ships and submarines but is generally unsuitable for aircraft due to the effects of high speed on its north-seeking properties.12

  • Gyromagnetic Compass: This system combines a magnetic compass with a directional gyroscope. While a gyroscope alone may suffer from drift over time, it provides stability during maneuvers, complementing the magnetic compass, which provides the directional reference. This combination is specifically designed for aircraft to provide stable heading information, correcting for errors induced by sudden changes in course or speed.34

In summary, the gyrocompass is a self-contained, non-magnetic north-seeking device, whereas the gyromagnetic compass is a hybrid system that uses a gyroscope to stabilize a magnetic compass.134