Head off

Hull speed

The theoretical maximum displacement speed of a monohull sailboat, approximated by 1.34 × …

Hard over

Turning the helm, tiller, or wheel as far as it will go in one direction.

Halyard

A line used to hoist, hold up, or lower a sail.

Holding tank

An on-board tank that stores sewage from the heads until it can be pumped out ashore or, w…

Heading sensor

A solid-state (usually fluxgate or MEMS) compass providing a fast-updating digital heading…

Hydrogenerator

A towed or transom-mounted propeller-driven generator that extracts electrical energy from…