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2. Sector (instrument) - Wikipedia

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

   The sector, also known as a sector rule, proportional compass, or military compass, was a major calculating instrument in use from the end of the sixteenth century until the nineteenth century. It is an instrument consisting of two rulers of equal length joined by a hinge.

3. Cammenga - Wikipedia

   en.wikipedia.org/wiki/Cammenga

   The M-1950 U.S. military lensatic field compass with self-luminous lighting (designated the Model 3H by Cammenga) is fitted with self-luminous tritium vial lighting. Under U.S. military specification (MIL-SPEC) performance criteria, ten pre-production samples of the M-1950 are required to meet a battery of performance, durability, and accuracy ...

4. Compass - Wikipedia

   en.wikipedia.org/wiki/Compass

   A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.

5. History of the compass - Wikipedia

   en.wikipedia.org/wiki/History_of_the_compass

   A sun compass uses the position of the Sun in the sky to determine the directions of the cardinal points, making allowance for the local latitude and longitude, time of day, equation of time, and so on. At fairly high latitudes, an analog-display watch can be used as a very approximate sun compass. A simple sundial can be used as a much better one.

6. Adrianov compass - Wikipedia

   en.wikipedia.org/wiki/Adrianov_compass

   The Adrianov compass (Russian: Компас Адрианова) is a military compass designed by Russian Imperial Army topographist Vladimir Adrianov in 1907. Wrist-worn versions of the compass were then adopted and widely used by the Red and Soviet Army. [1]

7. Suunto - Wikipedia

   en.wikipedia.org/wiki/Suunto

   The MC-2 optical-sight (mirror) compass, RA-69 and several other Suunto compasses have been issued to various NATO military forces over the years, including the British Army, Canadian Land Forces and several U.S. Special Forces units. [25] The Recta DP-6 matchbox-style compass is still used by the Swiss Army. [citation needed]