CFR 46-42.20-2014 Shipping. Part42:Domestic and foreign voyages by sea. Subpart42.20:Freeboards. Section42.20-60:Deduction for superstructures and trunks.
(a) Where the effective length of superstructures and trunks is 1.0L, the deduction from the freeboard shall be 14 inches at 79 feet length of vessel, 34 inches at 279 feet length, and 42 inches at 400 feet length and above; deductions at intermediate lengths shall be obtained by linear interpolation.
CFR 46-42.20-2014 history
2014CFR 46-42.20-2014 Shipping. Part42:Domestic and foreign voyages by sea. Subpart42.20:Freeboards. Section42.20-60:Deduction for superstructures and trunks.