In Listing 6, I snuck in another useful navigation element that I have not yet mentioned.
在清单6中，我悄悄地引入了一种还没有提到过的非常有用的导航元素。
Gerardus Mercator's projection, published in 1569, was immediately useful because it depicts a line of constant bearing as a straight line, which is handy for Marine navigation.
福西厄斯•墨卡托的投影于1569年问世，马上就派上了用场，因为它把不变的方位描绘为直线，这对航海非常方便。
Path planning is also one key aspect in virtual reality engine. One of its application automatic navigation of virtual camera is a useful technique, and worth studying.
路径规划也是虚拟现实引擎里一个重点，其中虚拟场景中的摄像机自动导航是一个具有实用价值的研究方向。
Fixed topologies are useful for navigation through a fixed sequence of pages in either a linear or hierarchical order.
以线性或阶层架构顺序巡览一连串固定顺序的页面时，固定拓扑十分有用。
Fixed topologies are useful for navigation through a fixed sequence of pages in either a linear or hierarchical order.
以线性或阶层架构顺序巡览一连串固定顺序的页面时，固定拓扑十分有用。
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