noun
nautical mile
A unit of distance used in maritime and aviation contexts, equal to approximately 1,852 meters.
この船は時速20海里で進んでいる。
This ship is traveling at 20 nautical miles per hour.
港まであと5海里です。
It's 5 nautical miles to the port.
Compound of 海 (sea) and 里 (traditional Japanese unit of distance, later used for 'mile'), referring to a sea mile.