CFR /  Title 46  /  Part 69  /  Sec. 69.173 Tonnage assignments for vessels with only one deck.

A vessel without a second deck is assigned only one gross and one net tonnage. In calculating the gross tonnage, only the exemptions in Sec. 69.169 (a) through (d) are allowed. Markings under Sec. 69.177 are not permitted on these vessels.