lasti- ja reisijateruumide, s.o. tulu andvate ruumide mahutavus
the measure of the useful capacity of a ship ...
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Varem mõõdeti laeva mahutavust registertonnides (brutoregistertonn, brt, ja netoregistertonn, nrt), alates 1982 (1994) on kasutusel mõisted "gross tonnage" (GT) ja "net tonnage" (NT). [11.09.2000]
An International Tonnage Certificate (1969) shall be issued to every ship, the gross and net tonnage of which have been determined in accordance with the Convention.
Rahvusvahelise konventsiooni „International Convention on Tonnage Measurement of Ships, 1969“ jõustumisest alates ei ole "net registered tonnage" enam kasutusel, kasutatakse "net tonnage"-t. [15.01.2013]
