Gross tonnage

Gross tonnage. Under the pre-1982 British tonnage system, for purposes of measurement, gross tonnage is the sum of the following volumes:

“underdeck tonnage” + tweendeck space between upper and second deck + volume of permanently closed in spaces on/above upper deck + “excess of hatchways” + lighting and ventilation spaces for propelling machinery.


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Gross terms (Gross Charter)

Guaranteed space per ton