L = Overall length of a vessel measured in feet in a straight horizontal line along and parallel with the centerline between the intersections of this line with the vertical planes of the stem and stern profiles excluding deckhouses and equipment.
F = The minimum freeboard when measured in feet from the lowest point along the upper strake edge to the surface of the water.
W = Maximum wave height in feet to the nearest highest whole number.
33 C.F.R. §165.1325