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	Eng ID	Term	Definition
	1821	firth	A Scottish word: an ARM OF THE SEA; an ESTUARY of a RIVER.
	1822	fish aggregating device (FAD)	See FISH HAVEN.
	1823	fishery conservation zone	See FISHING ZONE.
	1824	fish farm	An assemblage of cages, nets, rafts and floats or posts where fish, including shellfish, are artificially cultivated.
	1825	fish haven	Areas established by private interests, usually sport fishermen, to simulate natural reefs and wrecks that attract fish. The reefs are con... more Areas established by private interests, usually sport fishermen, to simulate natural reefs and wrecks that attract fish. The reefs are constructed by dumping assorted junk in areas which may be of very small extent or may stretch a considerable distance along a depth contour. Fish havens are outlined and labeled on charts. Also called fishery reefs.
	1826	fishing area	See FISHING GROUND.
	1827	fishing ground	A water area in which fishing is frequently carried on. Also called fishing area or fishing zone.
	1828	fishing reef	See FISH HAVEN.
	1829	fishing zone	The offshore zone in which exclusive fishing rights and management are held by the coastal nation.
	1830	fish lead	See LEAD.
	1831	fish (or fishing) stakes	Poles or stakes placed in SHALLOW WATER to outline FISHING GROUNDS or to catch fish.
	1832	fish trap (or weir)	A structure for catching fish. See also TUNNY NET.
	1833	fish trap buoy	A BUOY marking the limits of a fish trap area.
	1834	fish weir	See FISH TRAP.
	1835	fix	In NAVIGATION, a relatively accurate POSITION determined without reference to any former POSITION. It may be classed as visual, celestial, e... more In NAVIGATION, a relatively accurate POSITION determined without reference to any former POSITION. It may be classed as visual, celestial, electronic, etc., depending upon the means of establishing it.
	1836	fix	(v.t.). In hydrographic SURVEYING, to determine, at regular intervals, the POSITION of ships or boats, while sailing along a LINE OF SOUNDIN... more (v.t.). In hydrographic SURVEYING, to determine, at regular intervals, the POSITION of ships or boats, while sailing along a LINE OF SOUNDING. The usual method of fixing HYDROGRAPHIC SURVEYS within sight of LAND is the THREE-POINT FIX METHOD.
	1837	fix: circular	A useless FIX resulting from the OBSERVATIONS of two angles establishing as LOCI three coinciding CIRCLES OF POSITION. Also called rev... more A useless FIX resulting from the OBSERVATIONS of two angles establishing as LOCI three coinciding CIRCLES OF POSITION. Also called revolver, or swinger.
	1838	fix: running	A POSITION determined by crossing LINES OF POSITION obtained at different TIMES and advanced or retired to a common TIME, the expression bei... more A POSITION determined by crossing LINES OF POSITION obtained at different TIMES and advanced or retired to a common TIME, the expression being applied to a POSITION determined by advancing and retiring a line over a considerable period of time.
	1839	fix: split	A FIX obtained by measuring two angles to four objects whose POSITIONS are known, i.e. with no common centre object.
	1840	fix: three-point	A FIX obtained by simultaneously observing, with SEXTANTS, the two adjacent angles between three suitably disposed objects whose POSITIONS... more A FIX obtained by simultaneously observing, with SEXTANTS, the two adjacent angles between three suitably disposed objects whose POSITIONS are known, and plotting the POSITION by a STATION POINTER. See also RESECTION and THREE-POINT PROBLEM.
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