Gross tonnage The internal volume of a ship measured according to the tonnage measurement specification, expressed in tonnage. One ton is equal to 100 cubic foot (or 2.83 cubic meters). Ship tonnage is used for ship registration, so it is also called registered tonnage. Net tonnage refers to the total capacity of the ship's cargo space, calculated according to the formula stipulated in the measurement convention or specification.
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Ship tonnage is divided into gross tonnage and net tonnage. ① Gross tonnage: the total internal volume of the ship determined by measurement. Gross tonnage is generally used to indicate the size of ships, the number of ships owned by a country or a company, the calculation of shipbuilding costs and the calculation of ship insurance costs. It is used as a standard for dividing ships to determine technical management and equipment requirements in relevant international conventions and ship specifications, and as a charging standard for ship registration, inspection and measurement.
② Net tonnage: the effective volume of the ship after deducting the volume that cannot be used for carrying passengers and goods from the gross tonnage. The net tonnage is generally used as the calculation basis for the delivery of ship tax, port fee, water diversion fee, dock fee and agency fee. The passage tax for ships passing through Suez Canal and Panama Canal is calculated by net tonnage.
The ship's deadweight refers to the ship's deadweight, which is extremely important in transportation production. It can be divided into total payload and net payload.