Speed measured in nautical miles per hour is referred to as knots .

Now, coast guard vessels enforce a fishing ban within the lagoon and within a 12-nautical-mile radius around the atoll.

A ship carrying 20,000 tonnes of liquefied petroleum gas caught fire about 20 nautical miles east of Hong Kong waters.

Maximum tidal currents generally range from 0.5 to 1.5 knots and locally up to 5 knots at narrow channels.

The Athenian trireme was about 120 ft (37 m) long, and was rowed by 170 oarsmen seated in three tiers along each side;