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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.
Björn Kjellström (September 9, 1910 – August 26, 1995), originally from Sweden, was a ski orienteering champion in Sweden and co-founder of the compass manufacturing company Silva Sweden AB [1] which produced the Silva compass. More than 25 million Silva compasses have been sold since the founding of the company.
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 ...
Some military compasses, like the U.S. M-1950 (Cammenga 3H) military lensatic compass, the Silva 4b Militaire, and the Suunto M-5N(T) contain the radioactive material tritium (3 1 H) and a combination of phosphors. [37] The U.S. M-1950 equipped with self-luminous lighting contains 120 mCi (millicuries) of tritium.
Classic geological compass (Brunton), sideview Classic geological compass (Brunton), topview. There are a number of different specialized magnetic compasses used by geologists to measure orientation of geological structures, as they map in the field, to analyze and document the geometry of bedding planes, joints, and/or metamorphic foliations and lineations.
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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.
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