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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. Magellan Navigation - Wikipedia

   en.wikipedia.org/wiki/Magellan_Navigation

   Certain Magellan vehicle navigation systems are also Bluetooth-compatible for integration with mobile phones, and traffic upgradeable for real-time traffic information. The Maestro 4050 is the first portable vehicle navigation device to offer drivers the convenience of voice command capabilities.

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. 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.

6. Bearing compass - Wikipedia

   en.wikipedia.org/wiki/Bearing_compass

   A 8×42 compass monocular. There are also some models of monoculars/binoculars, with electric lighting or without, which by means of an hybrid optical system (some of them electronic-digital) allow the bearing marks to be viewed at the same time as the object is observed through its optical system.

7. Underwater acoustic positioning system - Wikipedia

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

   In recent years, several trends in underwater acoustic positioning have emerged. One is the introduction of compound systems such the combination of LBL and USBL in a so-called LUSBL [20] configuration to enhance performance. These systems are generally used in the offshore oil & gas sector and other high-end applications.