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I did, too, but I still don't get it. Is it a typo for "min" (as in minutes) ?


nm is "nautical miles". A "nautical mile" is a unit that feels more natural to people concerned with the globe shape of the Earth than the conventional mile (of 1609.34 metres) because it was equivalent to one minute of latitude.

Today it's just defined as 1852 metres.


Nautical miles




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