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2. Hand compass - Wikipedia

   en.wikipedia.org/wiki/Hand_compass

   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.

3. Bearing compass - Wikipedia

   en.wikipedia.org/wiki/Bearing_compass

   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).

4. Silva compass - Wikipedia

   en.wikipedia.org/wiki/Silva_compass

   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 ...

5. Underwater acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Underwater_acoustic...

   The combination of distance and direction fixes the position of the tracked target relative to the surface vessel. Additional sensors including GPS, a gyro or electronic compass and a vertical reference unit are then used to compensate for the changing position and orientation (pitch, roll, bearing) of the surface vessel and its transducer pole.

6. Ultra-short baseline acoustic positioning system - Wikipedia

   en.wikipedia.org/wiki/Ultra-short_baseline...

   USBL (ultra-short baseline, also known as SSBL for super short base line) is a method of underwater acoustic positioning.A USBL system consists of a transceiver, which is mounted on a pole under a ship, and a transponder or responder on the seafloor, on a towfish, or on an ROV.

7. Bearing (navigation) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(navigation)

   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.

8. Jacob's staff - Wikipedia

   en.wikipedia.org/wiki/Jacob's_staff

   In navigation the instrument is also called a cross-staff and was used to determine angles, for instance the angle between the horizon and Polaris or the sun to determine a vessel's latitude, or the angle between the top and bottom of an object to determine the distance to said object if its height is known, or the height of the object if its distance is known, or the horizontal angle between ...

9. Polespear - Wikipedia

   en.wikipedia.org/wiki/Polespear

   The pole is usually between four feet and ten feet long and made of fiberglass, carbon fibre, aluminum, graphite, or wood. Longer versions often break down into two or more pieces that screw together. The tip is either threaded to accept different kinds of spear tips or already has a fixed tip attached.