definition of
[naut mi]

[1] #1 naut mi n. a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile. wn

[2] #2 naut mi n. a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude. wn