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  2. Net tonnage - Wikipedia

    en.wikipedia.org/wiki/Net_tonnage

    Net tonnage is used to calculate the port duties and should not be taken as less than 30 per cent of the ship's gross tonnage. [2] 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 ...

  3. Gross tonnage - Wikipedia

    en.wikipedia.org/wiki/Gross_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 (IMO) in 1969, and came into force on 18 July 1982. These two measurements replaced gross register tonnage (GRT) and net register tonnage (NRT). Gross tonnage is calculated ...

  4. Ship measurements - Wikipedia

    en.wikipedia.org/wiki/Ship_measurements

    GT replaced Gross register tonnage (GRT) which is now an obsolete unit. Net tonnage – NT – Not expressible in units of mass or weight but is based on the cargo volume of the vessel in cubic meter with a formula applied. NT replaced Net register tonnage (NRT) which is now an obsolete unit.

  5. Tonnage - Wikipedia

    en.wikipedia.org/wiki/Tonnage

    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.

  6. Net register tonnage - Wikipedia

    en.wikipedia.org/wiki/Net_register_tonnage

    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.

  7. Moorsom System - Wikipedia

    en.wikipedia.org/wiki/Moorsom_System

    The total internal volume in cubic feet (0.028 m 3) was divided by 100 to produce the gross register tonnage. Net register tonnage was the volume remaining after subtracting the volume of the space used for machinery and other non-revenue producing functions. [1]

  8. Builder's Old Measurement - Wikipedia

    en.wikipedia.org/wiki/Builder's_Old_Measurement

    If a "tun" is deemed to be equivalent to 100 cubic feet, then the tonnage is simply the number of such 100 cubic feet 'tun' units of volume. 100 the divisor is unitless, so tonnage would be expressed in 'ft 3 of tun'. [1] In 1678 Thames shipbuilders used a method assuming that a ship's burden would be 3/5 of its displacement.

  9. Displacement (ship) - Wikipedia

    en.wikipedia.org/wiki/Displacement_(ship)

    The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. [1]