UK Nautical Miles
Nautical miles measure distance. 1 nautical mile is the angular distance of 1 minute of arc on the earth's surface. As these differ slightly (6108' at pole c.f. 6046' at equator) 6080 was adopted (this being it's approximate value in the English Channel). The International nautical mile is 1852 metres, so is very slightly different from the UK nautical mile.
cm =
UK nmi
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Centimeters
The centimetre is a unit of length in the metric system, equal to one-hundredth of a metre.
1cm is equivalent to 0.39370 inches.
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