In order to reduce costs and decrease attrition of steering gear is required as straight line navigation and playing fewer rudders.
同时当船舶在营运过程，为了降低成本、减少舵机磨损，需尽可能的直线航行、少打舵。
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。
For example, the Mercator projection is widely used by boats and ships because it produces a map in which lines of constant bearing are a straight line, which greatly simplifies navigation.
例如，墨卡托投影是广泛使用艘舟艇，因为它产生的地图中，不断轴承线一条直线，从而大大简化了导航。
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