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. 

Ships compass old hi-res stock photography and images - Alamy

History of Compass - Who Invented Compass?

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

Detect, Control, Engage': The Aegis Concept

The History of the Compass - Dalvey

Ship's Compass, 1764 - The Stirling Smith Art Gallery and Museum

File:Medieval ship and compass (Mandeville).jpg - Wikipedia

Compass, History, Uses & Types

The Song Dynasty in China

A History of the Ship's Compass

The Super Submarine: USS Albacore

Magnetic compass, Invention, History, & Facts

What is the History of Compass? - Issuu

Mariner's Compass Patent Print, Compass Design, Marine Navigation, Nautical Instrument, Naval History, Ship Wall Art Decor - Canada