#nautical_linear_unit  a linear unit of distance used in navigation
  supertype:  linear_unit  a unit of measurement of length
  subtype:  international_nautical_mile__nautical_mile__mile__mi__naut_mi__knot__air_mile__airmile  a unit of length used in navigation; equivalent to the distance spanned by one minute of arc in latitude; 1,852 meters
  subtype:  nautical_mile__naut_mi__mile__mi__geographical_mile__Admiralty_mile  a British unit of length equivalent to 1,853.18 meters (6,082 feet)
  subtype:  sea_mile__seamile__mile  a former British unit of length once used in navigation; equivalent to 1828.8 meters (6000 feet)

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