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Originally Posted by Torps
This is exact if you need to know
1nm = 1.15mph = 2024yards = 6072 feet
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No, that's not exact, or right. The correct conversion is 1.150779, making the nautical mile 2025.372 yards, or 6076.1155 feet. The nautical mile went through several changes over the years, but the one used in WW2 was set at exactly 1852 meters by the 1929 International Extraordinary Hydrographic Conference.
http://en.wikipedia.org/wiki/Nautical_mile
Of course we don't usually trust Wiki, so I would also refer you to a library to find a copy of the
American Practical Navigator, which is the definitive source for all good sailors.