A fitted deck and a method for installing the fitted deck above an as-built deck of a boat, ship or yacht (sometime referred to hereafter collectively as a vessel). Threaded stud elements are stud welded or glued to the surface of the as-built deck of the vessel to form a regular grid of threaded studs spaced close together (preferably about 1 foot apart). Onto each stud a "leveling plate" is threaded to a specific height preferably indicated by laser level indicator and a set of height specifications determined by a computer processor to achieve for the deck a desired camber, sheer, and slope. Support rails are spot welded to the leveling plates to provide a floor support for the deck. The support rails are preferably aligned in directions generally perpendicular to the vessel axis (i.e., aligned port to starboard). Specially designed batten rail fixtures aligned fore and aft (bow to stern parallel to the axis of the vessel) and are welded to the support rails to form a locking grid to lock in deck batten units. In a preferred embodiment the deck batten units are about 96 mm wide made by gluing a natural wood boards to a composite support to produce battens about 96 mm wide and several meters long. The wood is preferably teak about 12 mm thick and the composite material is reinforced plastic also about 12 mm thick. The composite support includes longitudinal groves on each side to lock the deck batten units into the specially designed batten rail fixtures. Once placed in the fixtures the deck batten units are locked into place with a locking spline which is covered with a narrow rubber-like material. The end result is a beautiful teak deck which is suspended above the as built deck maintaining a perfect camber, sheer, and sloop to assure drainage.