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	Eng ID	Term	Definition
	1261	dead astern	Bearing 180° relative. If the bearing is approximate, the term astern should be used. Also called right astern.
	1262	deadbeat	(adj.). Aperiodic, or without a PERIOD.
	1263	deadbeat compass	See COMPASS.
	1264	deadhead	(1) A block of wood used as anchor buoy. (2) A BOLLARD.
	1265	dead reckoning	A method of NAVIGATION utilizing only the SPEED and HEADING of the craft, without reference to external aids. In AIR NAVIGATION, the best e... more A method of NAVIGATION utilizing only the SPEED and HEADING of the craft, without reference to external aids. In AIR NAVIGATION, the best estimate of COURSE and SPEED over the GROUND is used, i.e., dead reckoning incorporates wind vector.
	1266	dead reckoning position	See POSITION.
	1267	dead reckoning tracer	A device that automatically provides a graphical record of the DEAD RECKONING TRACK. See COURSE RECORDER.
	1268	dead reckoning track	See TRACK.
	1269	dead water	The PHENOMENON which occurs when a ship of low propulsive power negotiates water which has a thin LAYER of fresher water over a deeper LAYER... more The PHENOMENON which occurs when a ship of low propulsive power negotiates water which has a thin LAYER of fresher water over a deeper LAYER of more saline water. As the ship moves, part of its energy goes into generation of an INTERNAL WAVE which causes a noticeable drop in efficiency of propulsion.
	1270	debris	See DETRITUS.
	1271	deceleration	Negative ACCELERATION.
	1272	decibar	One-tenth of a BAR.
	1273	decibel	See BEL.
	1274	decimetre	One-tenth of a METRE.
	1275	declination	In ASTRONOMY, the angle at the centre of the CELESTIAL SPHERE between the radius passing through a CELESTIAL BODY and the plane of the CELES... more In ASTRONOMY, the angle at the centre of the CELESTIAL SPHERE between the radius passing through a CELESTIAL BODY and the plane of the CELESTIAL EQUATOR. Declination is measured by the arc of the HOUR CIRCLE between the CELESTIAL BODY and the CELESTIAL EQUATOR. It is plus when the body is north of the EQUATOR, and minus when south of it.
	1276	declination: grid	See GRID.
	1277	declination: magnetic	See VARIATION.
	1278	declinational inequality	See DIURNAL INEQUALITY.
	1279	declination circle	See HOUR CIRCLE.
	1280	declinatoire	A combined MAGNETIC COMPASS and STRAIGHT EDGE, suitable for use on a PLANE TABLE to mark the MAGNETIC MERIDIAN. Also known as a box compass ... more A combined MAGNETIC COMPASS and STRAIGHT EDGE, suitable for use on a PLANE TABLE to mark the MAGNETIC MERIDIAN. Also known as a box compass or trough compass. See also COMPASS: TUBULAR.
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