Gross tons
Gross tons means the tonnage determined by the tonnage authorities of a vessel's flag state in accordance with the national tonnage rules in force before the entry into force of the International Convention on Tonnage Measurement of Ships, 1969 (Convention). For a vessel measured only under Annex I of the Convention, gross tons means that tonnage. For a vessel measured under both systems, the higher gross tonnage is the tonnage used for the purposes of the 300-gross-ton threshold.
Source
33 CFR § 160.202
Scoping language
Terms in this subpart that are not defined in this section or in 160.3 have the same meaning as those terms in 46 U.S.C. 2101. As used in this subpart