1. In the Royal Navy, the senior lieutenant on board; responsible to the commanding officer for the domestic affairs of the ship's company. Also known as 'Jimmy the One' or 'Number One'. Removes his cap when visiting the mess decks as token of respect for the privacy of the crew in those quarters. Officer in charge of cables on the forecastle. 2. In the US Navy, the officer on a ship serving as the senior person in charge of all deck hands.

Related Terms

ORTHOTROPIC DECK

A bridge deck constructed typically of flat steel plate and longitudinal and transverse ribs; functions in carrying traffic and acting as top flanges of floor beams.

FREEBOARD DECK

Deck to which freeboard is measured

TWEEN DECK

The space between any two adjacent decks

FLUSH DECK

The upper deck of a vessel that extends unbroken from stem to stern.

BEAR

Large squared off stone used with sand for scraping clean wooden decks.

BELOW DECKS

In or into any of the spaces below the main deck of a vessel.

FLIGHT DECK

The flat deck used for the launch and recovery of aircraft.

GUNWALE

The upper edge of the hull. The top timber on the rail round the outer edge of the deck.

POOP DECK

The high deck on the aft superstructure of a ship.

ORLOP

The lowest deck in a ship having four or more decks

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