46 CFR §69.173
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
A vessel without a second deck is assigned only one gross and one net register tonnage. In calculating the gross register tonnage, only the exemptions in § 69.169 (a) through (d) are allowed. Markings under § 69.177 are not permitted on these vessels.