Tonnage, Gross


Gross tonnage is a measure of a ship's total internal volume, including all enclosed spaces, and is used to determine things such as a ship's manning regulations, safety rules, and registration fees. It is calculated by using a mathematical formula that takes into account the volume of all enclosed spaces of a ship. Gross tonnage is different from net tonnage, which deducts non-revenue-earning spaces such as crew quarters and engine rooms. Gross tonnage is an important factor in determining a ship's size and capacity, and is often used as a basis for port fees and taxes.


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