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PuzzleheadedBit1939 t1_iy37r9s wrote on November 28, 2022 at 12:13 PM

Reply to comment by yacht_boy in Eli5: Why did ships and navies come up with their own system of units (nautical miles, knots, fathoms, etc)? Is it still used? by Dewi2020

The paragraph after the one you highlighted says that the 3mile/hour number is generous and based off some battle where exceptional marching speed could have been expected.