46 CFR § 45.63
Correction for sheer
April 15, 2021
(a) The minimum summer freeboard must be increased by the deficiency, or may be decreased by the excess as limited by §45.65, of sheer calculated from table 4, multiplied by:
0.75—(S/2L)
where S is the total length of enclosed superstructures. Trunks are not included.