A knot is one nautical mile per hour, used in aviation and at sea. One knot is about 1.15 mph because a nautical mile is longer than a statute mile.
On the water
Marine essentials.
Handheld GPS
Track speed and position.
Wind speed meter
Measure knots directly.
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Frequently asked questions
How many mph is a knot?
One knot equals 1.15078 mph.
Why do boats and planes use knots?
Nautical miles map neatly onto lines of latitude, making navigation calculations simpler.