Dead reckoning and estimated positions

A Dead Reckoning Position The Log Ship Estimated Positions The Traverse Board

In the 15th century the pioneers of the great European age of exploration made long ocean voyages using nothing but dead reckoning. Columbus relied on it for his 1492 voyage and reconstructions from his logs (he kept two) showed he managed an accuracy of well over 90%. If they practised the new art of celestial navigation they usually did this ashore, with the aim of obtaining positions to support claims of sovereignty and to update their charts.

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