The knot is the unit of speed used at sea: one nautical mile per hour, i.e. 1.852 km/h. A container ship cruising at 16 knots covers about 384 nautical miles per day.
Commercial vessel speeds typically range from 10–12 knots in slow steaming mode, adopted to cut fuel consumption and emissions, up to 20–24 knots of design speed for large container ships. Transit time between two ports derives directly from distance in nautical miles divided by speed in knots.
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