为了回答这个问题，要用卫星校准你的全球定位系统，核对坐标，再用铅笔把它们标注在航海图中就可以了。
To find out, align your global positioning system with some satellites, check the co-ordinates and pencil them on to a chart.
这要求他们掌握潜艇机械、电学、航海以及通信系统方面的应用知识。
This requires a working knowledge of Marine mechanical, electrical, navigational, and communication systems.
最后一部分从个案比较中挖掘出笛福小说中的文明、乐观的进取精神，从西方航海小说系统中透视笛福小说的内在文化价值。
The last part exploits the civil and hopeful spirits of Defoe's novels from the comparison, and sees inside the cultural value in the western navigation novels.
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