What does Tonnage mean?
Meaning of "Tonnage"
A measure of the volume of a ship. In simple terms the gross tonnage (GRT)represents the total enclosed volume of the ship and the net tonnage (NT) represents the volume of cargo and passenger spaces. Tonnage is defined by internationally agreed formulae, and is used for dues for drydocking and pilotage and port and harbour dues etc. It should be noted that tonnage represents a function of volume and should not be confused with deadweight mass (tonnes), Lightship mass (tonnes) or displacement mass (tonnes).