推測航法
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定義
既知の位置を起点として、記録された速度、経過時間、進行方向を用いて船舶や車両の現在位置を推定する方法。
解説
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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