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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.
History of Compass - Who Invented Compass?
The Christopher Columbus Navigation Lesson Nobody Taught Us
Beat to Quarters — Types of compasses on board ships in the 17th and
magnetic compass Archives - The Productive Teacher
Naval History Magazine - December 2022, Volume 36, Number 6
Sold at Auction: Museum Quality C.R. Sherman & Co. Ship Compass
Magnetic compass, Invention, History, & Facts
NORTH AMERICA MAP BY SANSON 1650'S SHIP COMPASS TELESCOPE IN 3D FORM-FRAMED
Magnetic compass, Invention, History, & Facts
Compass Museum - History - Bibliography
The History of the Compass - Dalvey
Naval History Magazine - December 2022, Volume 36, Number 6