Mechanical gyroscopes are beginning to be replaced by ring-laser or hemispherical-resonator ones, but most ships retain a traditional magnetic compass as a backup—just in case.
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Chinese Compass, Pigafetta's Compass, and Dudley's Ship's Compass, 1646. Original caption: From: Early Science in Oxford, Vol. 1, by R. T. Gunther, Oxford, 1921 Stock Photo - Alamy
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