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Extreme Beam

For ships other than aircraft carriers, the extreme beam is the maximum breadth, in feet, of the ship at or below the main deck to the outside of the hull over blister plating, guards, or armor.

For aircraft carriers, this is the maximum breadth, in feet, at or about the flight deck including any fixed projections at nearby levels.

NAVSHIPSO
NAVSEA Shipbuilding Support Office
Norfolk Naval Shipyard Detachment
3751 Island Avenue, Third Floor
Philadelphia, PA 19153-3297
(215) 365-5767
(215) 365-5506 (FAX)