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aid to navigation
a device or object, external to the vessel, located to assist safe navigation. It may be man-made or natural
a device designed to hold a ship in any desired location by temporarily attaching it to the seabed by means of a rode
the direction of the wind as it appears on board. It differs from the true wind direction due to the vessel's motion
(1) a deck fitting used to change the direction of tension of an anchor rode or mooring line; (2) a fitting designed to receive an object and hold it securely
the sector extending from dead ahead to 22.5 degrees abaft the starboard beam, an arc of 112.5 degrees in all
the process of determining a vessel's position, using only knowledge of speed, elapsed time, course steered, and a point of departure
(1) a unit of speed equal to one nautical mile per hour; (2) the tucks and loops in a line used to fasten it to an object or to itself
lateral buoyage system
a buoyage system in which different coloured buoys are used to mark the sides of a channel
the angular distance of any point on the earth's surface north or south of the equator, as measured at the earth's centre
the angular distance of any point on the earth's surface east or west of the prime meridian, as measured at the polar axis
the north direction indicated by an isolated magnetic compass for which the deviation is nil
one of the two geographical areas, north and south, where the earth's magnetic field enters or leaves the earth
a unit of distance defined as 1852 metres, equivalent to the length of one minute of latitude
(1) two aids to navigation which, when seen to be in line establish a line of position; (2) the difference in height between high and low tides
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