Nautical

The "doldrums" is a popular nautical term that refers to the belt around the Earth near the equator where sailing ships sometimes get stuck on windless waters.

A nautical mile measures distance and a knot measures speed.

A nautical mile is based on the circumference of the earth, and is equal to one minute of latitude.

A nautical mile is equal to 1.1508 statute miles.

A knot is one nautical mile per hour.

Iron is used in nautical construction.

Nautical charts are known to have been in use since the thirteenth century A.D., but the earliest extant of which the date can be fixed is Vesconte's loxodromic chart of 1311.

nautical charts

I was mostly unfamiliar with the nautical terms used in the sailing documentary.

The mainsail was "scandalised" - a nautical mode of describing a sail reefed at both ends[.]