The tariff applied for chartering tonnage in a particular trade.


Related Terms

NET TONNAGE

See Tonnage (Net)

PILOTAGE DUES

A fee payable by the owner or operator of a ship for the services of a pilot. This fee is normally based on the ship's tonnage.

INTERNATIONAL TONNAGE CERTIFICATE

A certificate issued to a shipowner by a government department in the case of a ship whose gross and net tonnages have been determined in accordance with the International Convention of Tonnage Measurement of Ships. The certificate states the gross and net tonnages together with details of the spaces attributed to each.

NRT

Net registered tons. See Tonnage (Net)

SHELTER DECK

A superstructure deck fitted continuous from stem to stern and fitted with at least one tonnage opening

GROSS TONNAGE

Gross tonnage includes a ships internal volume, excluding such spaces as the peak, double bottom, deep tanks used only for water ballast, bridge, forecastle, open-ended poop, certain light and air spaces, skylights, anchor and steering gear spaces, toilets, the wheelhouse, and certain passenger spaces

TONNAGE OPENINGS

Nonwatertight openings in the shelter deck and in the tween deck bulkheads immediately below in order to exclude spaces from tonnage measurement and thus obtain reduced gross and net tonnage. The openings could be closed by nonwatertight wood shifting boards or metal covers meeting the tonnage and load line regulations

TONNAGE

A measure of the internal volume of spaces within a vessel in which 100 cu.ft.. is 1 ton

NET TONNAGE

Net tonnage is the gross tonnage less certain additional spaces such as crew and officer spaces, chart room, and a percentage of the propelling machinery spaces; also see deadweight, displacement, light and displacement, loaded

DWAT

A common measure of ship carrying capacity. The number of tons (2240 lbs.) of cargo, stores and bunkers that a vessel can transport. It is the difference between the number of tons of water a vessel displaces 'light' and the number of tons it displaces 'when submerged to the 'deep load line'.' A vessel's cargo capacity is less than its total deadweight tonnage. The difference in weight between a vessel when it is fully loaded and when it is empty (in general transportation terms, the net) measured by the water it displaces. This is the most common, and useful, measurement for shipping as it measures cargo capacity.

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