Modern Ship & Shipbuilding Terminology

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Deadweight: Deadweight tonnage or DwT is the absolute maximum weight that a ship can safely carry when fully loaded. It includes crew, passengers, cargo, fuel, water, and stores. Often expressed in long tons or metric tons. Acronym: dwt. It is measured by measuring the displacement difference when the vessel is empty (or light) and fully loaded.
Displacement Tonnage: The actual weight of a ship and its contents. One displacement ton, measuring the displacement of seawater while a ship is afloat, is equivalent to one long ton or about one cubic meter (35 cubic feet) of salt water.
Frigate: A warship used primarily for escort duty. Most frigates are between 4,000 to 9,000 displacement tons and they are often larger than destroyers but smaller than cruisers. Earlier definition of frigate
GRT: Gross Register Tonnage is the cubic capacity of all enclosed spaces of a ship, more often used then NRT for calculating cargo capacity of a vessel. A Gross Register Ton is equal to 2.83 cubic meters or 100 cubic feet.
NRT: Net Register Tons, the true cargo capacity of a ship. NRT signifies the cubic below-deck cargo or passenger capacity used for the vessel's revenue generation only. For taxation purposes normally GRT is used. A Net Register Ton is equal to 2.83 cubic meters or 100 cubic feet.
TPI: Tons Per Inch immersion.
TPC: Tons Per Centimeter immersion.

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