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2. Hand compass - Wikipedia

   en.wikipedia.org/wiki/Hand_compass

   Floating-card compass with prismatic sight (bearing 220° through eyepiece). The marine hand compass, or hand bearing compass|hand-bearing compass as it is termed in nautical use, has been used by small-boat or inshore sailors since at least the 1920s to keep a running course or to record precise bearings to landmarks on shore in order to determine position via the resection technique.

3. Silva compass - Wikipedia

   en.wikipedia.org/wiki/Silva_compass

   Silva Field baseplate compass on a map. Silva Sweden AB is an outdoors products company that sells handheld compasses and other navigational equipment including GPS tools, mapping software, aircraft altimeters, and marine navigation tools.

4. Fibre optic gyrocompass - Wikipedia

   en.wikipedia.org/wiki/Fibre_optic_gyrocompass

   It is sometimes part of a ship's set of compasses, which also include a conventional gyrocompass and a magnetic compass under SOLAS requirements for the ship to be fitted with compass systems. [2] The compass comprises a fibre optic gyroscope sensor that operates on the principle of the Sagnac effect which links to a computer and then locates ...

5. Bearing compass - Wikipedia

   en.wikipedia.org/wiki/Bearing_compass

   A 8×42 compass monocular. There are also some models of monoculars/binoculars, with electric lighting or without, which by means of an hybrid optical system (some of them electronic-digital) allow the bearing marks to be viewed at the same time as the object is observed through its optical system.

6. Pelorus (instrument) - Wikipedia

   en.wikipedia.org/wiki/Pelorus_(instrument)

   In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "simplified compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings. [1] The instrument was named for one Pelorus, said to have been the pilot for Hannibal, circa 203 BC.

7. Gyrocompass - Wikipedia

   en.wikipedia.org/wiki/Gyrocompass

   In the United States, Elmer Ambrose Sperry produced a workable gyrocompass system (1908: U.S. patent 1,242,065), and founded the Sperry Gyroscope Company. The unit was adopted by the U.S. Navy (1911 [3]), and played a major role in World War I. The Navy also began using Sperry's "Metal Mike": the first gyroscope-guided autopilot steering system.