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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.
They include survival navigation instructions using the US lensatic compass and basic celestial orientation for use when lacking a compass or GPS, use of the survival radio, edible and dangerous plants, fish, and animals found in the map area, sea current flow rates, first aid instructions, and other localized survival tips.
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 ...
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.
There are older variants which use a wooden beam. Another similar type is a Machinist or Engineers beam compass, which uses scribing points only, similar to ones used by woodworkers, except that its fine adjustment is generally more refined. These beam compasses can be extended by adding press-in rods, or by using a lockable rod connector. [4]
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A beam compass and a regular compass Using a compass A compass with an extension accessory for larger circles A bow compass capable of drawing the smallest possible circles. A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs.
As of 2008, JWA (now known as Johnson Outdoors, Inc.) was sourcing most of its Silva brand compasses from PT Uwatec Batam, an Indonesia-based wholly owned subsidiary of Johnson Outdoors, Inc. [3] The discontinued Silva 424 Wrist Sighting Compass was made for Johnson Outdoors by Suunto Oy of Finland, while the Silva Lensatic 360 compass is made ...