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The Net tonnage calculation is defined in Regulation 4 of Annex 1 of The International Convention on Tonnage Measurement of Ships, 1969. It is based on three main variables: V c, the total volume of the ship's cargo spaces in cubic meters (m³), d, the ship's moulded draft amidships in meters, and; D, the ship's moulded depth amidships in metres
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Net tonnage is a dimensionless index calculated with a mathematical formula. While this template allows, for the sake of backwards compatibility, the use of "tons" as the unit for net tonnage, this is not correct and should not be used in future articles.
The gross tonnage calculation is defined in Regulation 3 of Annex 1 of The International Convention on Tonnage Measurement of Ships, 1969. [3] It is based on two variables, and is ultimately an increasing one-to-one function of ship volume: V, the ship's total volume in cubic metres (m 3), and; K, a multiplier based on the ship volume.
Tonnage is a measure of the capacity of a ship, and is commonly used to assess fees on commercial shipping.The term derives from the taxation paid on tuns or casks of wine. In modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship.
Net register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals to a volume of 100 cubic feet (2.83 m 3).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.
Lightweight displacement – LWD – The weight or mass of the ship excluding cargo, fuel, ballast, stores, passengers, and crew, but with water in the boilers to steaming level. Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can ...
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