Do you know that a NM is NOT everywhere the same distance.
As Alyebard wrote:"But if you use to sail, 1 nm is equal a 1´ and is very useful when you try to find your position at sea with a sextant ( and is not very easy)" if you use a map an 1´ is different in the Mediterranean sea and the north Pole ,thus when you plan your route on the map is not always good to consider 1nm=1852m (i mean big trips ,from one hemisphere to the other)
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It's much better down there
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