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by iaw 3447 days ago
I'm not sure if it would matter if they were really inaccurate if the ship used the same sandglass and rope. I've read about the shipping log -> world map work [1] where it details that the speeds/distances for a given group of boats had different errors which the gentlemen developed a technique to resolve.

[1] https://priceonomics.com/a-map-of-the-world-made-from-shippi...