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Glossary

Gross Tonnage

Gross Tonnage, along with Net Tonnage, was defined by The International Convention on Tonnage Measurement of Ships, 1969, adopted by the International Maritime Organization in 1969, and came into force on July 18, 1982.

These two measurements replaced Gross Register Tonnage (GRT) and Net Register Tonnage (NRT).

Gross Tonnage is calculated based on "the moulded volume of all enclosed spaces of the ship" and is used to determine things such as a ship's manning regulations

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