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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. 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 ...

4. 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).

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. Pelorus (instrument) - Wikipedia

   en.wikipedia.org/wiki/Pelorus_(instrument)

   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. [1] The instrument was named for one Pelorus, said to have been the pilot for Hannibal, circa 203 BC.

7. Automatic identification system - Wikipedia

   en.wikipedia.org/wiki/Automatic_identification...

   AIS information received by VTS is important for accident investigation since it provides accurate historical data on time, identity, GPS-based position, compass heading, course over ground, speed (by log/SOG), and rates of turn, rather than the less accurate information provided by radar.