Gross tonnageGross tonnage (GT, G.T. or gt) is a nonlinear measure of a ship's overall internal volume. Gross tonnage is different from gross register tonnage. Neither gross tonnage nor gross register tonnage should be confused with measures of mass or weight such as deadweight tonnage or displacement.
Net register tonnageNet register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals a volume of 100 cubic feet (2.83 m). It is calculated by subtracting non-revenue-earning spaces i.e. spaces not available for carrying cargo, for example engine rooms, fuel tanks and crew quarters, from the ship's gross register tonnage. Net tonnage is thus used in situations where a vessel's earning capacity is important, rather than its mere size.
International Convention on Load LinesThe International Convention on Load Lines (CLL), was signed in London on 5 April 1966, amended by the 1988 Protocol and further revised in 2003. It replaced an earlier convention from 1930 with the same name.
Deadweight tonnageDeadweight tonnage (also known as deadweight; abbreviated to DWT, D.W.T., d.w.t., or dwt) or tons deadweight (DWT) is a measure of how much weight a ship can carry. It is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.
Displacement (ship)The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used.
International Maritime OrganizationThe International Maritime Organization (IMO; French: Organisation maritime internationale, Spanish: Organización Marítima Internacional, OMI) is a specialized agency of the United Nations regulating maritime transport. It was established following agreement at a UN conference held in Geneva in 1948, but it did not come into force for ten years until the new body, then called the Inter-governmental Maritime Consultative Organization, first assembled on 6 January 1959.
United StatesCountry primarily in North AmericaThe United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic consisting of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean.
SOLAS ConventionThe International Convention for the Safety of Life at Sea (SOLAS) is an international maritime treaty which sets out minimum safety standards in the construction, equipment and operation of merchant ships. The International Maritime Organization convention requires signatory flag states to ensure that ships flagged by them comply with at least these standards.*As an Amazon Associate I earn from qualifying purchases.