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Gross register tonnage is a measure of the internal volume of a ship expressed in units of 'register tons'. Gross register tonnage (GRT, grt, g.r.t.) represents the total internal volume of a vessel, while Net register tonnage accounts for certain non-productive spaces and is always lesser in value. A register ton is equal to a volume of 100 cubic feet (~2.83 m³).[1][2]

Gross register tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as gross tonnage, deadweight tonnage, net tonnage, or displacement.[1][3]

Calculation of gross register tonnage is complex; a hold can, for instance, be assessed for grain (accounting for all the air space in the hold) or for bales (exempting the dead space between the ship's ribs).

It has been superseded by Gross Tonnage and is not used or even calculated for modern ships.

Notes

  1. ^ a b Fisheries andAquaculture Department. "CWP Handbook of Fishery Statistical Standards". Food and Agriculture Organization of the United Nations. http://www.fao.org/fishery/cwp/handbook/L. Retrieved 2008-03-12.  
  2. ^ Since 1959, 100 cubic feet is 2.8316846592 cubic metres exactly.
  3. ^ The corresponding mass depends on what the volume is filled with, for example, 1 GRT of water weighs around 2,800 kg.

References

  • Hayler, William B. (2003). American Merchant Seaman's Manual. Cornell Maritime Press. ISBN 0-87033-549-9.  .
  • Turpin, Edward A.; McEwen, William A. (1980). Merchant Marine Officers' Handbook (4th ed.). Centreville, MD: Cornell Maritime Press. ISBN 0-87038-056-X.  

See also

External links

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