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Glossary term Description
Handymax

Bulk carrier (or bulker) of 40,000–49,999 dwt. A large Handymax is 50,000–59,999 dwt. The term may also be applied to a large medium-range (MR) tanker of 40,000–54,999 dwt

Handysize bulk carrier

Large Handysize 25,000–39,999 dwt; small Handysize 10,000–24,999 dwt. The term Handysize may also be applied to a small medium-range (MR) tanker

hard-top open-top container Container that opens at the top and can be closed with a solid roof (steel sheet). Like all containers that open at the top, this is suitable for crane loading.
HAT Highest Astronomical Tide. Replaces MHWS as the base measurement for bridge and overhead cable heights on BA charts.
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.
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

HFO

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

high-cube container

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

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

High-speed ship, type of high-speed ferry