Ship Tonnage and Measurement Definitions
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Displacement Tonnage
Displacement tonnage is the total weight of the volume of water a ship displaces when it is sitting in the water.
Standard Displacement Tonnage
Standard displacement tonnage is basically the same thing as displacement tonnage, but you must subtract the weight of any fuel and potable water carried on board the ship.
Deadweight Tonnage
Deadweight tonnage is the weight of all the cargo, fuel, dry provisions, supplies, etc. carried on board the ship.
Lightweight Tonnage
Lightweight tonnage is described as the weight of the ship when it was built in the shipyard, including all framing, machinery, decking, etc.
Gross Registered Tonnage
Gross registered tonnage is a measurement of the volume of all enclosed spaces on a ship, with 100