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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.
A bearing compass, is a nautical instrument used to determine the bearing of observed objects. (Bearing: angle formed by the north and the visual to a certain object in the sea or ashore). (Bearing: angle formed by the north and the visual to a certain object in the sea or ashore).
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. Silva's founders - Gunnar Tillander, Alvar Kjellström, Arvid Kjellström, and Björn Kjellström - invented the hugely popular orienteering ...
In marine navigation, starboard bearings are 'green' and port bearings are 'red'. Thus, in ship navigation, a target directly off the starboard side would be 'Green090' or 'G090'. [7] This method is only used for a relative bearing. A navigator on watch does not always have a corrected compass available with which to give an accurate bearing.
A fishing reel is a device used for the deployment and retrieval of a fishing line using a spool mounted on an axle. Fishing reels are traditionally used in angling. They are most often used in conjunction with a fishing rod, though some specialized reels are mounted on crossbows or to boat gunwales or transoms. The earliest known illustration ...
These changes had a significant effect on nautical instrument manufacturers, as the magnetic compass for a wooden sailing vessel was very simple and required little in the way of compensation. For steel vessels much more was required and this was a period of great development, both in the compass bowl and the binnacle in which it was housed.
The azimuth compass still had great value in letting the master of a ship determine how far the magnetic compass varied from true north, so he could set a more accurate course while following a line of constant latitude or using dead reckoning to navigate. In 1795 a British First Rate ship would have up to eight compasses, of which one was an ...
Cutaway of an Anschütz gyrocompass A gyrocompass repeater. A gyrocompass is a type of non-magnetic compass which is based on a fast-spinning disc and the rotation of the Earth (or another planetary body if used elsewhere in the universe) to find geographical direction automatically.