Gross register tonnage (GRT) and net register tonnage (NRT) have been replaced by gross tonnage (GT) and net tonnage (NT) which express the size and volume of a ship.
Gross tonnage (GT) is a function of the volume of all of a ship's enclosed spaces (from keel to funnel) measured to the outside of the hull framing.
Net tonnage (NT) is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces.
Deadweight (DWT) is the maximum deadweight of the ship and measure the ship carrying capacity.
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