Gross register tonnage
Gross register tonnage (GRT, grt, g.r.t., gt) or gross registered tonnage, is a ship's total internal volume expressed in "register tons", each of which is equal to 100 cubic feet (2.83 m3). Replaced by
Net register tonnage subtracts the volume of spaces not available for carrying cargo, such as engine rooms, fuel tanks and crew quarters, from gross register tonnage.
Gross register tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as deadweight tonnage or displacement.
Gross register tonnage was defined by the Moorsom Commission in 1849. Gross and net register tonnages were replaced by gross tonnage and net tonnage, respectively, when the International Maritime Organization (IMO) adopted The International Convention on Tonnage Measurement of Ships on 23 June 1969. The new tonnage regulations entered into force for all new ships on 18 July 1982, but existing vessels were given a migration period of 12 years to ensure that ships were given reasonable economic safeguards, since port and other dues are charged according to ship's tonnage.
Since 18 July 1994 the gross and net tonnages,
- Ton (volume)
- ISBN 9780415275576, retrieved 2011-10-17
- ^ "Units and Systems of Measurement Their Origin, Development, and Present Status" (PDF). National Institute of Standards and Technology. Archived from the original (PDF) on 19 October 2011. Retrieved 17 October 2011.
- ^ International Convention on Tonnage Measurement of Ships Archived 2013-12-02 at the Wayback Machine. International Maritime Organization (IMO). Retrieved 2011-10-17.