knots versus mph
A nautical mile is 1/60th of the length of a degree (or one second) of a great circle of the earth.
The nautical mile is often miscalled "Knot". A knot is a not a measure of distance, but a measure of speed equal to one nautical mile per hour. The admiralty knot is equal to 6080 feet per hour. Therefore a knot is 6080/5280 = 1.1515151... to a statute mile.
~ Happy sails to you ~ _/) ~