航位推算
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定义
从已知位置出发，利用记录的速度、经过时间和航向来估算船舶或载具当前位置的过程。
解释
Before GPS, dead reckoning was the primary open-ocean navigation method. Errors accumulate over time because small inaccuracies in speed or direction compound with each calculation. Columbus used dead reckoning to cross the Atlantic, and Apollo mission computers used it to track the spacecraft's position between Earth and the Moon. Modern inertial navigation systems automate the same principle with accelerometers and gyroscopes.
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