Really the only option they had was to rely on something called dead reckoning, basically figuring out where you are by estimating your speed and compass heading to plot your journey.
实际上他们唯一的选择是依靠一种名为航位推算的方法，大体通过估计航速和指南针指向来确定你的位置，从而规划航程。
Compass heading
原声例句
PBS趣味科普
英语百科
Points of the compass
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The points of the compass are points on a compass, specifically on the compass rose, marking divisions of the four cardinal directions: North, South, East, West. The number of points may be only the four cardinal points, or the eight principal points adding the intercardinal (or ordinal) directions northeast (NE), southeast (SE), southwest (SW), and northwest (NW). In meteorological usage further intermediate points are added to give the sixteen points of a wind compass. Finally, at the most complete in European tradition, are found the full thirty-two points of the mariner's compass. In ancient China 24 points of the compass were used, measuring fifteen degrees between points.
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