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Glossary term Description
Hz

Hertz. SI unit of frequency

hydrocarbon

An organic compound containing hydrogen and carbon

humidity motor Circulation produced when the temperature gradient between the cargo and the container wall is too steep. This increases the transport of humidity to the surfaces of the container.
HSS

High-speed ship, type of high-speed ferry

hp Horsepower (l/c). When referring to tugs the international metric standard used for engine output is kilowatt (kW).
high-cube container

Large-volume container, as it is 9½ feet high (as opposed to 8 ft or 8½ ft).

HFO

Heavy fuel oil, a grade of marine fuel (bunkers)

heeling

Heel, heel angle: temporary inclination of a ship to one side along its fore-and-aft axis. The heel angle describes the inclination of the ship - its deviation from the perpendicular

heavy-lift steel cornerpieces These are angled steel plates attached to the bottom and/or top of cargo items to prevent damage by slinging equipment.
HAT Highest Astronomical Tide. Replaces MHWS as the base measurement for bridge and overhead cable heights on BA charts.