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declinometer | 磁倾仪，方位计，偏角计
| 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 | 一种类似于测量罗盘的磁性仪器，仅结构上有差别。该仪器的照准线可旋转到磁针或其它水平度盘内任何指定点方向，用于测量磁偏角。参见variation（磁差）。 |
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declivity | 坡降，坡度
| A downward SLOPE or sloping of a HILL; as opposed to ACCLIVITY. | 山的一个向下倾斜的斜坡或坡度；与上斜相对应。 |
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deep | 深处、深渊
| In OCEANOGRAPHY, an obsolete term which was generally restricted to DEPTHS greater than 6,000 m. An unmarked fathom point on a LEAD LINE. | 1.在海洋学中的一个过时的术语，一般仅指深度大于6000米的地方。
2.在测深绳上没有英寻标记点的报告用语。 |
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deep-draught route | 深水航路
| 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 | 主要用于深吃水船舶航行的航路，它们在这条航道以外航行可能是不安全的。 |
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deep ocean floor | 洋底，深海底
| The surface lying at the bottom of the deep ocean. | 深海海底表面。 |
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deep scattering layer (DSL) | 深海散射层，深散射层
| See PHANTOM BOTTOM. | 参见phantom bottom（假海底）。 |
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deep-sea camera | 深海相机
| See CAMERA. | 一种经过特殊设计，用于在海底获取影像的相机。 |
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deep sea lead | 深海测深锤
| See LEAD. | 一种重量在15至50公斤的测深重锤，其重量大小取决于待测水深的深度。也称为dipsey lead（深水砣）。 |
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deep sea thermometer | 深海温度计
| See THERMOMETER. | 一种用于测量任何深度海水温度的温度计。参见protected reversing thermometer（闭管颠倒温度表）、reversing thermometer（颠倒温度计）、unprotected reversing thermometer（无保护颠倒温度计）。 |
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deep water route | 深水航道
| A route in a designated area within defined limits which has been accurately surveyed for clearance of sea bottom and submerged obstacles to... more | 指定区域内满足定义限制的航路，在该区域内海底和水下障碍物已进行过精确测量，并确定了最小水深。 |
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defile | 峡谷，隘路
| A narrow PASS or GORGE between MOUNTAINS. | 山之间的狭窄通道或峡谷。 |
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definition | 清晰度；分辨率
| In PHOTOGRAPHY, and electronic equipment, the degree of clarity and sharpness of an IMAGE. See RESOLUTION and RESOLVING POWER. | 在摄影测量和电子设备中，图像的清晰度和锐度，参见resolution（分辨率）和resolving power（分辨能力）。 |
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deflection of the plumb line | 垂线偏差
| See DEFLECTION OF THE VERTICAL. | 参见deflection of the vertical（垂线偏差）。 |
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deflection of the vertical | 垂线偏差
| 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 | 地球上一点铅垂线方向与参考椭球体法方向的夹角。也称作deflection of the plumb line（垂线偏差），deviation of the vertical（垂线偏差），station error（垂线偏差）。 |
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deflector | 偏转角，磁罗经校正仪 | An instrument for measuring the directive force acting on a MAGNETIC COMPASS on different HEADINGS, for use in COMPASS ADJUSTMENT. | 用于测量不同船首方向上作用于磁罗经上的指向力的仪器。这种仪器主要用于罗经校正。 |
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degaussing | 消磁，退磁，去磁 | Neutralization of the strength of the MAGNETIC FIELD of a vessel, by means of suitably arranged electric coils permanently installed in the ... more | 安装在船上不同位置的、永久的线圈，用于抵消船舶磁场强度。亦可参见 degaussing cable（消磁电缆）。 |
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degaussing cable | 消磁电缆 | See CABLE. | 用于船上消磁的带电电缆。 |
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degree | 度
| A unit of angular or circular-arc measurement, equal to 1/360 of a circle. A unit of measurement of temperature in any SCALE. | 1.角度或圆弧测量单位，等于圆的1/360。
2.表示温度的测量单位。 |
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Delambre's spheroid | 德朗布尔椭球体
| See REFERENCE SPHEROID. | 见“参考椭球体”。 |
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delimitation | 划界
| The process of establishing the LINE(S) OF DELIMITATION in the context of the United Nations' Law of the Sea Convention. | 在联合国海洋法公约框架下，确定分界线的过程。 |