How to Convert MPH to Nautical Miles
Miles per hour, abbreviated mph, quantifies the speed at which you are traveling. Nautical miles, on the other hand, quantifies a distance. Nautical miles are used most often in flying and sailing. You might need to convert from mph to nautical miles if you know the speed at which you are traveling, but want to figure out how far you've gone. All you need to know is the time you've been traveling and the conversion factors.
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Instructions
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Multiply the boat's speed in miles per hour by the number of hours you have been traveling at that speed. For example, if you have been traveling 21 mph for 1.5 hours, multiply 21 by 1.5 to get 31.5 standard miles.
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Convert from standard miles to nautical miles by dividing the number of standard miles by 1.1508. In this example, divide 31.5 by 1.1508 to get 27.37 nautical miles.
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Check your conversion by multiplying the number of standard miles by 0.86896. In this example, confirm your conversion by multiplying 31.5 by 0.86896 to get 27.37 nautical miles.
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