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saddle | 鞍部，山口，海山鞍部 | A broad PASS or COL, resembling in shape a riding saddle in a RIDGE or between contiguous ELEVATIONS. | 山坳、隘口或任何马鞍状地形。
海脊上或海山之间的低凹部分。 |
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safety aids | 助航设备 | See AID TO NAVIGATION. | 参见aids to navigation（助航标志）。 |
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safety fairway | 安全航道 | An area within which permits are not granted for the erection of oil or gas related structures. The use of a safety fairway is not usually ... more | 在其范围内不允许建设与油、气有关的建筑的区域。安全航道一般不强制使用，只是建议使用。 |
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safety zone | 安全区 | The area around an offshore installation within which vessels are prohibited from entering without permission. Special regulations protect i... more | 近海设施周围的水域，船只未经许可禁止进入。在安全区内有专门规定的防护设施，所有国际的船只均应遵守该区域的规定。 |
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SafetyNET | 国际SafetyNET服务
| The international service for the broadcast and automatic reception of MARITIME SAFETY INFORMATION via the INMARSAT EGC system in waters whe... more | 在NAVTEX服务未覆盖的区域，通过INMARSAT EGC系统播发和自动接收海上安全信息的国际服务。 |
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safe water mark | 安全标志 | In the IALA Maritime Buoyage System a NAVIGATION MARK used to indicate that there is NAVIGABLE WATER around its POSITION with no known haza... more | 在国际航标协会（IALA）海上浮标系统中，指示其周围有可航水域且附近没有已知碍航物的安全标志。 |
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sag correction (tape) | NULL | See TAPE: SAG CORRECTION. | NULL |
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sailing | 航法 | A method of solving the various problems involving COURSE, distance, DIFFERENCE OF LATITUDE, DIFFERENCE OF LONGITUDE and DEPARTURE. The va... more | 解决诸如航道、距离、维差、经差、横距等一系列问题的方法，这些不同的方法统称为航法。 |
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sailing: composite | 组合航法 | A modification of GREAT-CIRCLE SAILING used when it is desired to limit the highest LATITUDE. | 为满足高纬地区的航行而对大圆航法改进得到的航法。 |
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sailing: great circle | NULL | Any SAILING when a GREAT CIRCLE TRACK is involved. | NULL |
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sailing: Mercator | 墨卡托航法
| A mathematical solution of the plot as made on a MERCATOR CHART. It is similar to PLANE SAILING, but uses MERIDIONAL DIFFERENCE and DIFFERE... more | 在墨卡托海图上标绘航线的一种数学方法。这种航行类似于平面航法，但在纬差和东西距不同的地点需分别利用对应的子午线弧长差和不同的经差。 |
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sailing: meridian | 子午线航法
| Following a TRUE COURSE of 0° or 180°; SAILING along a MERIDIAN. | 真航向为0°或180°，即沿某一经线航行。 |
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sailing: middle-latitude | 中分纬度航法
| A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is not 90° or 270°, by assuming that suc... more | 当真航向不是90°或270°时，假定在中分纬度处调整航向，将东西距转换为经差（或反向转换）的一种航法。 |
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sailing: parallel | 等纬线航行；平行航法
| A method of converting DEPARTURE into DIFFERENCE OF LONGITUDE, or vice versa, when the true COURSE is 90° or 270°. | 当真航向为90°或270°时，将东西距转换为经差（或反向转换）的一种方法。 |
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sailing: plane | 平面航法 | A SAILING in which the EARTH or a small part of it is considered a plane. | 将地球表面或某一区域视为平面的一种航行方法。 |
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sailing: rhumb line | NULL | Any SAILING when a RHUMB LINE is involved. | NULL |
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sailing: spherical | 球面航法 | Any of the SAILINGS which consider the spherical or spheroidal shape of the EARTH. | 任何将地球视为球体或椭球体而进行航行的方法。 |
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sailing: traverse | 分段航法 | A method of determining the equivalent COURSE and distance made good by a craft following a TRACK consisting of a series of RHUMB LINES. T... more | 船舶通过一系列分段等角航线航行时，确定最终等值航向与航程的方法。该问题的解决方法一般采用平面航法原理。 |
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sailing chart | 航行图 | See under CHART. | 用于近海航行的小比例尺海图。 |
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sailing directions | 航路指南 | Information published in book form describing COASTS, waters, CHANNELS, harbour facilities, etc., for use by mariners. | 以书本形式出版的描述海岸、水域、航道、港口设备等的资料，供航海人员使用。 |