The unit of measurement for the internal capacity of a vessel whereby one register ton equals 100 cubic feet (2.83 cubic meter). The gross (bruto) tonnage comprises all spaces below the main (tonnage) deck and the enclosed spaces above the main (tonnage) deck less exempted spaces. The net tonnage consists of the gross tonnage less exemptions like ballast tanks, engine room, living quarters etc. The register tonnages are mentioned on the tonnage certificate.
