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leading line | 叠标线，导航线
| (British terminology). A line passing through two or more clearly defined charted objects, and along which a vessel can approach safely. | （英国术语）通过海图上标绘的两个或多个确定目标的连线，船舶沿该线航行可以保证安全。 |
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leading marks | 导标
| (British terminology). AIDS TO NAVIGATION or other indicators so located as to indicate the path to be followed. Leading marks identify ... more | （英国术语）助航设备或其它指示器，用于标示航道。当通过它们时，导标作为导航线的标志。亦可参见ra... more |
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lead line | 测深索
| A line, graduated with attached MARKS and fastened to a SOUNDING LEAD, used for determining the DEPTH of water when making SOUNDINGS by hand... more | 系在测深锤上的标有刻度的绳子。当手工测深时用于测定水深。通常用于深度小于45米的水域（25英寻）。... more |
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lead line correction | 测深索改正
| A CORRECTION to be applied to the DEPTHS taken with a rope LEAD LINE to take into account the shrinking and stretching. This difficulty ha... more | 考虑到测深索的收缩和扩张因素，对使用测深索测量的水深实施的改正。这个问题目前已经通过在测深索... more |
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leadsman | 水砣手
| A person using a SOUNDING LEAD to determine DEPTH of water. | 使用测深锤测量水深的人。 |
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league | 里格
| A varying measure of distance, usually about three MILES. | 测量距离的单位，通常1里格约为3英里。 |
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leaper | 小浪花
| See LIPPER. | 参见lipper（小浪花）。 |
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leap year | 闰年
| See YEAR: CIVIL. | 参见civil year（民用年）。 |
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least count | 最小读数
| The finest reading that can be made directly (without estimation) from a VERNIER or MICROMETER. | 直接由游标千分尺或测微器读取（不是估计）的最小读数。 |
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least depth | 最浅水深
| The shoalest sounding value obtained on a feature. | 获得的海底地貌的最浅水深。 |
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least squares | 最小二乘
| A method of adjusting OBSERVATIONS in which the sum of the squares of all the deviations or residuals derived in fitting the OBSERVATIONS to... more | 对观测值进行平差的一种方法。在这种方法中，观测值拟合于一种数学模型而得出的所有偏差或残差的平... more |
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ledge | 石梁，石滩，暗礁，壁架
| A shelf-like projection, on the side of a ROCK or MOUNTAIN. A rocky formation continuous with and fringing the SHORE. | 处于岩石或山旁的架状突出物。
与海岸相连的岩礁。 |
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lee | 下风，背风，背浪
| That side towards which the WIND blows; the sheltered side. | 风吹向的那一侧；避风面。 |
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lee shore | 下（背，顺）风岸
| SHORE that is to leeward of a vessel. See WEATHER SHORE. | 处于船的下风方向的海岸。参见weather shore（上风岸）。 |
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lee tide | NULL | See TIDE: LEEWARD. | NULL |
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leeward | 下风，背风，顺风
| (adj. and adv.). Toward the LEE, or in the general direction toward which the WIND is blowing. The opposite is WINDWARD. | （形容词和副词）。朝下风方向，或朝向风吹向的大致方向，反义词为 windward（上风）。 |
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leeward tidal current | 顺风潮流
| See TIDE: LEEWARD. | 参见leeward tide（顺风潮流）。 |
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leeward tide | 顺风潮流
| See TIDE. | 流向与风向相同的潮流。亦可称为leeward tidal current（顺风潮流）。 |
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leeway | 风压差，航差角，偏流角
| The leeward motion of a vessel due to WIND. It may be expressed as distance, SPEED, or angular difference between COURSE steered and COURSE ... more | 由于风的作用使船朝下风方向运动，它以距离、速度，或罗经航向与水流方向的角度差表示。偏航角。亦... more |
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leeway angle | 风流压差角，偏航角
| The angle between true heading and track of a vessel caused by wind action. | 真航向与因风作用的航向之间的角度。 |