Navigation —— 导航 （ wikipedia: [[Course_(navigation)]] ）
图片来源：http://en.wikipedia.org/wiki/File:Course_(navigation).svg维基百科相关条目：http://en.wikipedia.org/wiki/Course_(navigation)
图中内容的注释：
1 - True North
真北
2 - Heading, the direction the vessel is "pointing towards"
航向，舰船船艏的指向。
3 - Magnetic north, which differs from true north by the magnetic variation.
磁北，由于磁偏角的存在导致磁北与真北不一致。
4 - Compass north, including a two-part error; the magnetic varation (6) and the ship's own magnetic field (5)
罗盘北，含有两个错误：磁偏角和船只本身的磁场
5 - Magnetic deviation, caused by vessel's magnetic field.
磁偏转，由船只本身的磁场引起。
6 - Magnetic variation, caused by variations in earth's magnetic field.
磁变，由地球磁场变化引起。
7 - Compass heading or compass course, before correction for magnetic deviation or magnetic variation.
罗盘航向或罗盘航线。未修正磁偏转或磁变。
8 - Magnetic heading, the compass heading corrected for magnetic deviation but not magnetic variation; thus, the heading reliative to magnetic north.
磁航向，修正了磁偏转但未修正磁变，也就是相对于地球的北磁极的航向。
9, 10 - Effects of crosswind and tidal current, causing the vessel's track to differ from its heading.
风和海流使船的航迹与航向不同
A, B - Vessel's track.
船的航迹 学习了！
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