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  2. Diver navigation - Wikipedia

    en.wikipedia.org/wiki/Diver_navigation

    Nav finder and underwater compass – basic underwater navigation tools Suunto SK-7 diving compass in aftermarket wrist mount with bungee straps. Diver navigation, termed "underwater navigation" by scuba divers, [1] is a set of techniques—including observing natural features, the use of a compass, and surface observations—that divers use to navigate underwater.

  3. History of the compass - Wikipedia

    en.wikipedia.org/wiki/History_of_the_compass

    A surface liquid-filled compass on a boat A Greek maritime liquid compass with an additional wick compartment for illumination. The liquid compass is a design in which the magnetized needle or card is damped by fluid to protect against excessive swing or wobble, improving readability while reducing wear.

  4. Navigational instrument - Wikipedia

    en.wikipedia.org/wiki/Navigational_instrument

    Bearing compass used to determine magnetic bearings of landmarks, other ships or celestial bodies. Magnetic compass used to determine the magnetic heading of the ship. Timekeeping

  5. Pelorus (instrument) - Wikipedia

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

    Pelorus aboard HMS Belfast. 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.

  6. Gyrocompass - Wikipedia

    en.wikipedia.org/wiki/Gyrocompass

    A gyroscope, not to be confused with a gyrocompass, is a spinning wheel mounted on a set of gimbals so that its axis is free to orient itself in any way. [3] When it is spun up to speed with its axis pointing in some direction, due to the law of conservation of angular momentum , such a wheel will normally maintain its original orientation to a ...

  7. 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.