Statute miles and Nautical miles

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References:
1 nautical mile = 1.15 statute miles (rule of thumb)
1 nautical mile = 1.15077945 statute miles (approximate)
1 nautical mile = 57875/50292 statute miles (exact)

1 statute mile = 0.86 nautical mile (rule of thumb)
1 statute mile = 0.86897624 nautical mile (approximate)
1 statute mile = 50292/57875 nautical mile (exact)

http://en.wikipedia.org/wiki/Nautical_mile
http://library.csum.edu/navpubs/Bowditch.pdf
http://www.boatsafe.com/nauticalknowhow/miles.htm