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	Eng ID	Term	Definition
	221	archipelagic baseline(s)	See BASELINE.
	222	archipelagic sea lane	Sea lanes designated by an ARCHIPELAGIC STATE for the passage of ships and aircraft.
	223	archipelagic state	A State constituted wholly by one or more archipelagos, eventually including other islands.
	224	archipelagic waters	The waters enclosed by ARCHIPELAGIC BASELINES.
	225	archipelago	A group of ISLANDS.
	226	arc of triangulation	See TRIANGULATION: ARC OF.
	227	arc of visibility	The arc of a LIGHT SECTOR designated by its limiting BEARINGS in which a LIGHT is visible as viewed from a vessel.
	228	Arctic circle	The GEOGRAPHICAL PARALLEL having a north latitude equal to the complement of the DECLINATION of the SUMMER SOLSTICE (latitude = 66° 33' N a... more The GEOGRAPHICAL PARALLEL having a north latitude equal to the complement of the DECLINATION of the SUMMER SOLSTICE (latitude = 66° 33' N approximately).
	229	arc to chord correction	The quantity used by seamen to correct a GREAT CIRCLE BEARING of a point B from a point A to a MERCATOR BEARING, and usually referred to as ... more The quantity used by seamen to correct a GREAT CIRCLE BEARING of a point B from a point A to a MERCATOR BEARING, and usually referred to as the half convergency. On the MERCATOR PROJECTION, this quantity is equal to half the convergency, on the SPHEROID, of the MERIDIANS through the two points being considered. Also called conversion angle. See CONVERGENCE OF THE MERIDIANS.
	230	area	In United Nations Law of the Sea terminology the sea-bed and ocean floor and subsoil thereof, beyond the limits of national jurisdiction.
	231	area clearance	The effective depth, within specified limits, obtained by a WIRE DRAG SURVEY.
	232	area to be avoided	A routing measure comprising an area within defined limits in which either navigation is particularly hazardous or it is exceptionally impor... more A routing measure comprising an area within defined limits in which either navigation is particularly hazardous or it is exceptionally important to avoid casualties and which should be avoided by all ships, or certain classes of ships.
	233	area survey	A method of BOTTOM RELIEF SURVEY consisting of surveying overlapping strips which allow soundings to be obtained with a specified accuracy a... more A method of BOTTOM RELIEF SURVEY consisting of surveying overlapping strips which allow soundings to be obtained with a specified accuracy at any position of the area under survey.
	234	argillaceous	(adj.). Applied to all ROCKS or SEDIMENTS composed partly or completely of CLAY.
	235	arming	Tallow or other substance placed in the recess at the lower end of a SOUNDING LEAD for obtaining a sample of the BOTTOM. See BOTTOM SAMPLE.
	236	arm of the sea	A narrow portion of the SEA projecting from the main body. The expression is often shortened to 'arm'.
	237	ARPA	See AUTOMATIC RADAR PLOTTING AID.
	238	array(s)	The order in which equipment (antenna, oceanographic equipment) or mathematical quantities are ordered.
	239	articulated beacon	A vertical pipe structure that oscillates around a universal coupling connected to a sinker. The structure is kept upright by the buoyancy o... more A vertical pipe structure that oscillates around a universal coupling connected to a sinker. The structure is kept upright by the buoyancy of a submerged floating chamber. Primarily designed to mark narrow channels with greater precision than conventional buoys.
	240	articulated light	See ARTICULATED BEACON.
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