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The traffic route of both cargo and passenger vessels which are regularly engaged on the high seas or on long voyages.

Related Terms


A route within defined limits in which two-way traffic is established, aimed at providing safe passage of ships through waters where navigation is difficult or dangerous.


Cargo more than eight feet high which thus cannot fit into a standard container.


A group of two or more vessel-operating carriers, which provides international liner services for the carriage of cargo on a particular trade route and which has an agreement or arrangement to operate under uniform or common freight rates and any other agreed conditions (e.g. FEFC


When chemical carriers load high value and very pure products, they will commence loading until about one foot of cargo is in the bottom of the tank, then stop. They will take a sample this cargo, known as the foot sample up the facility's lab for analysis to see if during the loading of this one foot of cargo there was any contamination. If not, they will resume loading the tank until completion. If contamination is present in the foot sample they will try to determine the source, while they pump the now off spec cargo to the shore, and start over again, It is hoped that the amount loaded during the foot of cargo is enough to clean the contamination from the tank and piping. This is done to prevent the entire tank being loaded and then contaminated thereby requiring the full cargo to be reprocessed.


Net Tonnage - the replacement, since 1994, for 'Net Register Tonnage.' Theoretically the cargo capacity of the ship. Sometimes used to charge fees or taxes on a vessel. The formula is(0.2+0.02 log10(Vc)) Vc (4d/3D)2, for passenger ships the following formula is added: 1.25 (GT+10000)/10000 (N1+(N2/10)), where Vc is the volume of cargo holds, D is the distance between ship's bottom and the uppermost deck, d is the draught, N1 is the number of cabin passengers, and N2 is the number of deck passengers.) 'Ton' is gured as a 100 cubic foot ton. An approximate conversion ratio is 1NT


A sprinkler like device which is used with high pressure to clean the inside of cargo tanks. One famous brand name is 'butterworth'. Therefore when a tank is butterworthed it is being cleaned.


A routeing measure to separate the flow of vessels in areas of high traffic density, usually the approaches to busy harbours. Vessels should enter and exit the zones at their termination points.


A removal of all traces of a cargo from the tanks of a tanker normally by means of high pressure water jets.


A one-way route which vessels have to comply with within a traffic separation scheme


Having cargo loaded as high as the ship's rail.

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