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Disappointed in not receiving recognition for his improvements, Ritchie turned his attention to navigational instruments. Ritchie began making marine bearing compasses for the U.S. Navy before the American Civil War (→ Union Navy). At the time, British Admiralty dry-mount nautical compasses were considered by all navies and merchant shipping ...
A bearing compass is a magnetic compass mounted in such a way that it allows the taking of bearings of objects by aligning them with the lubber line of the bearing compass. [79] A surveyor's compass is a specialized compass made to accurately measure heading of landmarks and measure horizontal angles to help with map making.
Pelorus aboard HMS Belfast. 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.
This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.
This includes an overall inherent accuracy standard of ±40 mils (2.25 degrees) from actual magnetic azimuth; [1] [2] a tritium illumination test; [3] and a shock or impact test, in which samples of the M-1950 are tested dropping the compass from a height of 90 cm (35 in.) on a solid surface covered with 10 cm (4 in.) of plastic-covered sand ...
Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.