Hawse Pipe - Casting, or castings, through deck and side of ship at bow for passage of anchor chain.
Category: - Maritime

Hawser - Large strong rope used for towing purposes and for securing or mooring ships. Hawsers are now mostly made of steel.
Category: - Maritime

Hazard - Activity task, operation, tool or agent that is a significant source of personal physical risk and potential negative consequences
Category: - Risk

Haze - Fine dust or salt particles dispersed through a portion of the atmosphere which reduce visibility. Haze is distinguished from fog by its bluish or yellowish tinge.
Category: - Weather

Heave To - To stop a boat and maintain position (with some leeway) by balancing rudder and power to prevent forward movement, a boat stopped this way is "hove to"
Category: - Maritime

Heavy Rainfall Warning - Whenever 50 mm or more of rain is expected in a 24-hour period, a heavy rainfall warning is issued.
Category: - Risk - Weather

Heavy Snowfall Warning - A warning is issued when 15 cm of snow or more is expected in a 24-hour period. It may be issued for lesser amounts at the beginning or end of the snow season.
Category: - Risk - Weather

Heeling - The inclination of a vessel to one side.
Category: - Maritime - Risk

Helm - A tiller or a wheel generally installed on the bridge or wheelhouse of a ship to turn the rudder during manoeuvering and navigation. It is in fact the steering wheel of the ship.
Category: - Maritime

Helmsman - An able-bodied seamen entrusted with the steering of a vessel.
Category: - Maritime