Definition of gross tonnage and net tonnage
Net tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as deadweight tonnage or displacement. Also, unlike the net register tonnage, the net tonnage is unitless and thus can not be defined as tons or net tons .Since 1969, gross tonnage has been the principal means by which a commercial ship is defined. The gross tonnage measurement has a number of legal and administrative uses. It is used to determine regulations, safety rules, registration fees, and port charges for the vessel. definition of gross tonnage and net tonnage
Gross tonnage, along with net tonnage, was defined by The International Convention on Tonnage Measurement of Ships, 1969, adopted by the International Maritime Organization in 1969, and came into force on July 18, 1982. These two measurements replaced gross register tonnage (GRT) and net register tonnage (NRT).
Definition of gross tonnage and net tonnage free
Also called net tonnage, it is usually the basis for computing harbor or port charges. (4) Dead weight tonnage (DWT) is the maximum weight (mass) of a ship when loaded up to its summer load line (see Plimsoll line) and is the sum of the weights of the cargo, crew, fuel, passengers, and stores.
between gross gang hours and idle gang hours. Idle ganghours The difference between the grossgang hours and net ganghours. Gross Registered Tonnage or Gross Tonnage This is the volume of all enclosed spaces of a ship. The measure of the internal volume of space within a vessel expressed in terms of 100 cubic feet a ton,
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Gross tonnage is calculated based on the moulded volume of all enclosed spaces of the ship and is used to determine things such as a ship's manning regulations, safety rules, registration fees, and port dues, whereas the older gross register tonnage is a measure
Net Tonnage: is a vessel's gross tonnage minus deductions of space occupied by accommodations for crew, by machinery, for navigation, by the engine room and fuel. A vessel's net tonnage expresses the space available for the accommodation of passengers and the stowage of cargo.
Net tonnage definition is the gross tonnage of a ship less deductions for space occupied by crew's quarters, machinery for navigation, engine room, and fuel.
Therefore, a ship whose gross tonnage is listed as 150 tons (the Santa Maria, for example) is known to have a carrying capacity of 15 000 cubic feet (150 tons x 100 cubic feet).
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