Question: how many mph = knots? 

Answer: 1 nautical mile = 1.15 miles\n\nnautical mile\nn. Abbr. nm \nA unit of length used in sea and air navigation, based on the length of one minute of arc of a great circle, especially an international and U.S. unit equal to 1,852 meters (about 6,076 feet). Also called sea mile.
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