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	Term	术语	Definition	定义
	dead astern	正后方	Bearing 180° relative. If the bearing is approximate, the term astern should be used. Also called right astern.	相对方位180°。如果方位是近似的，则应该使用术语“astern”。
	deadbeat	非周期性的	(adj.). Aperiodic, or without a PERIOD.	形容词，非周期性的，或没有时期。
	deadbeat compass	无震荡罗经，非周期罗经	See COMPASS.	一种非周期的罗盘；当偏转时，直接返回到其适当的读数。
	deadhead	木锚标；系缆木	(1) A block of wood used as anchor buoy. (2) A BOLLARD.	1.作为锚泊浮标的一块木头。 2.一个系缆桩。
	dead reckoning	航迹推算，船位推算	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.	1.一种航行方法，利用船舶速度和航向，而无需参考其他外部助航物推算传为的方法。 2.在空中导航中，�... more 1.一种航行方法，利用船舶速度和航向，而无需参考其他外部助航物推算传为的方法。 2.在空中导航中，应采用最佳的航向和对地速进行估算，例如结合风矢量的推算。
	dead reckoning position	推算船位	See POSITION.	通过推算或对上一位置的航向和距离进行推演得到的船舶位置。
	dead reckoning tracer	航迹记录仪	A device that automatically provides a graphical record of the DEAD RECKONING TRACK. See COURSE RECORDER.	一种自动提供航迹推算轨迹记录图的设备。
	dead reckoning track	船位推算线	See TRACK.	表示船舶连续推算航迹位置的线。
	dead water	死水（水线处随着船体移动的水），船舷侧旋涡	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.	低推进功率的船舶通过咸水层上有一薄层淡水的水域时发生的现象。当船移动时，部分能量用于产生内波�... more 低推进功率的船舶通过咸水层上有一薄层淡水的水域时发生的现象。当船移动时，部分能量用于产生内波，导致船的推进效率明显下降。
	debris	岩屑	See DETRITUS.	参见detritus（岩屑）。
	deceleration	减速	Negative ACCELERATION.	负加速度。
	decibar	分巴	One-tenth of a BAR.	十分之一巴。
	decibel	分贝	See BEL.	参见bel（贝尔）。
	decimetre	公寸	One-tenth of a METRE.	十分之一公尺。
	declination	赤纬，倾角，偏角	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.	在天文学中，指天球赤道平面与穿过天体半径之间的夹角。赤纬是通过天体与天体赤道之间的时圈弧计算�... more 在天文学中，指天球赤道平面与穿过天体半径之间的夹角。赤纬是通过天体与天体赤道之间的时圈弧计算。在赤道以北为正，在赤道以南为负。
	declination: grid	格网真北偏角，子午线收敛角	See GRID.	坐标北和真北方向的夹角。角度从真北向东或者向西量取。
	declination: magnetic	磁偏角，磁差	See VARIATION.	参见variation（磁差）。
	declinational inequality	日潮不等	See DIURNAL INEQUALITY.	参见diurnal inequality（日潮不等）。
	declination circle	赤纬圈	See HOUR CIRCLE.	参见hour circle（时圈）。
	declinatoire	方框罗经	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.	磁罗经和直尺的组合，适合在平桌上使用，用于标记磁子午线。也称作盒方框罗盘、长盒方框罗盘。亦可�... more 磁罗经和直尺的组合，适合在平桌上使用，用于标记磁子午线。也称作盒方框罗盘、长盒方框罗盘。亦可参见tubular compass（管式罗盘）。
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