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	Eng ID	Term	Definition
	1281	declinometer	A magnetic instrument similar to a SURVEYOR'S COMPASS, but arranged so that the LINE OF SIGHT can be rotated to conform with the NEEDLE or t... more A magnetic instrument similar to a SURVEYOR'S COMPASS, but arranged so that the LINE OF SIGHT can be rotated to conform with the NEEDLE or to any desired setting on the HORIZONTAL CIRCLE. Used in determining the magnetic declination. See VARIATION.
	1282	declivity	A downward SLOPE or sloping of a HILL; as opposed to ACCLIVITY.
	1283	deep	In OCEANOGRAPHY, an obsolete term which was generally restricted to DEPTHS greater than 6,000 m. An unmarked fathom point on a LEAD LINE.
	1284	deep-draught route	A route which is primarily selected for use by ships which, because of their deep DRAUGHT, may not be able to navigate safely outside such r... more A route which is primarily selected for use by ships which, because of their deep DRAUGHT, may not be able to navigate safely outside such route.
	1285	deep ocean floor	The surface lying at the bottom of the deep ocean.
	1286	deep scattering layer (DSL)	See PHANTOM BOTTOM.
	1287	deep-sea camera	See CAMERA.
	1288	deep sea lead	See LEAD.
	1289	deep sea thermometer	See THERMOMETER.
	1290	deep water route	A route in a designated area within defined limits which has been accurately surveyed for clearance of sea bottom and submerged obstacles to... more A route in a designated area within defined limits which has been accurately surveyed for clearance of sea bottom and submerged obstacles to a minimum indicated depth of water.
	1291	defile	A narrow PASS or GORGE between MOUNTAINS.
	1292	definition	In PHOTOGRAPHY, and electronic equipment, the degree of clarity and sharpness of an IMAGE. See RESOLUTION and RESOLVING POWER.
	1293	deflection of the plumb line	See DEFLECTION OF THE VERTICAL.
	1294	deflection of the vertical	The angle at a point on the EARTH (GEOID) between the VERTICAL (direction of the PLUMB LINE) and the direction of the NORMAL to the SPHEROID... more The angle at a point on the EARTH (GEOID) between the VERTICAL (direction of the PLUMB LINE) and the direction of the NORMAL to the SPHEROID OF REFERENCE through the point. Also called deflection of the plumb line, deviation of the vertical, or station error.
	1295	deflector	An instrument for measuring the directive force acting on a MAGNETIC COMPASS on different HEADINGS, for use in COMPASS ADJUSTMENT.
	1296	degaussing	Neutralization of the strength of the MAGNETIC FIELD of a vessel, by means of suitably arranged electric coils permanently installed in the ... more Neutralization of the strength of the MAGNETIC FIELD of a vessel, by means of suitably arranged electric coils permanently installed in the vessel. See also CABLE: DEGAUSSING.
	1297	degaussing cable	See CABLE.
	1298	degree	A unit of angular or circular-arc measurement, equal to 1/360 of a circle. A unit of measurement of temperature in any SCALE.
	1299	Delambre's spheroid	See REFERENCE SPHEROID.
	1300	delimitation	The process of establishing the LINE(S) OF DELIMITATION in the context of the United Nations' Law of the Sea Convention.
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