A History of the Ship's Compass

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. 

How does a magnetic compass work? - Explain that Stuff

ship's compass - AbeBooks

S.F International Antique Flat Bronze Compass 3 Titanic Ship History ENGRAVE VTG Brass Compass : : Home & Kitchen

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

Compass

Ship's Magnetic Compass - Dry and Wet Compass with their care, maintenance and bubble removal

Explained: The science behind how compasses work - Times of India

The Evolution of Frigates in the Age of Sail

1800S-UP ANTIQUE COMPASS Collectors Guide w Ship, military, early British & More £31.27 - PicClick UK

Antique Flat Bronze Compass 3 Titanic Ship History ENGRAVE Compass 2 Pieces : : Home

WWII US NAVY Property Tag: Ship's Gyro-Compass Navigation Tool; Azimuth Circle

The Ship's Compass and its Binnacle - South Street Seaport Museum

The History of the Pocket Compass - Dutch Antiques

Magnetic Compass - National Maritime Historical Society