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Navigational instruments are instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction , etc. to arrive at the port or point of destination.
Navigation (from the Latin word navigatio) is the act of sailing or voyaging.Nautical (from Latin nautĭca, and this from Greek ναυτική [τέχνη] nautikḗ [téjne] "[art of] sailing" and from ναύτης nautes "sailor") is that pertaining to navigation and the science and art of sailing.
All nautical instruments that measure the speed of a ship through water are known as logs. [2] This nomenclature dates back to the days of sail, when sailors attached a piece of lumber (a "log" of wood) to a rope knotted at regular intervals off the stern of a ship. Sailors counted the number of knots that passed through their hands in a given ...
Pelorus (instrument) Personal navigation assistant; Pitometer log; Planisphere; Plotter (instrument) Plough (instrument) Points of the compass; Port Chalmers time ball; Portolan chart; Pressure reference system; Pulse-Doppler radar
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).
Three Mariner's Astrolabes in the Museum of the Forte da Ponta da Bandeira; Lagos, Portugal. The mariner's astrolabe, also called sea astrolabe, was an inclinometer used to determine the latitude of a ship at sea by measuring the sun's noon altitude (declination) or the meridian altitude of a star of known declination.
1859 Helmsman's marine sandglass, in a four-column wood stand. A marine sandglass is a timepiece of simple design that is a relative of the common hourglass, a marine (nautical) instrument known since the 14th century (although reasonably presumed to be of very ancient use and origin).
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.
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