HALYARD - Aline used to raise the head of a sail.

HARBOR - A place where marine vessels may shelter from the weather or are stored.

HARD CHINE - An abrupt intersection between the hull side and the hull bottom of a marine vessel so constructed.

HATCH - An opening in a marine vessel's deck fitted with a watertight cover.

HEAD - A marine toilet.

HEADSAIL - Any sail flown in front of the most forward mast.

HEADING - The direction in which a vessel's bow points at any given time.

HEADWAY - The forward motion of a marine vessel. Opposite of sternway.

HELM - The wheel or tiller controlling the rudder.

HELMSMAN - The person steering the marine vessel.

HITCH - A knot used to secure a rope to another object or to another rope, or to form a loop or a noose in a rope.

HOLD - A compartment below deck in a large vessel, used solely for carrying cargo.

HOTEL - Letter H in the Marine Radio Alphabet.

HULL - The main body of a vessel.

HYDROFOIL - A marine vessel with wing-like foils mounted on struts below the hull.