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. 

Magnetic compass, Invention, History, & Facts

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Armaments & Innovations

Antique Civil War Era E.S. RITCHIE SHIPS COMPASS Patented 1863 United States Nautical History Very Rare Museum Quality - Australia

Compass, History, Uses & Types

GeoGarage blog: The magnetic compass

Sold at Auction: Museum Quality C.R. Sherman & Co. Ship Compass

The History of the Compass - Dalvey

Compass

Compass - Ages of Exploration

File:Ship compass navy museum toulon.jpg - Wikimedia Commons

PDF) Compasses and sinking ships: Mrs Janet Taylor's contribution in the compass adjusting controversy of mid-nineteenth-century England