Compensated gross tonnage

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Compensated Gross Tonnage (CGT) is an indicator of the amount of work that is necessary to build a given ship and is calculated by multiplying the tonnage of a ship by a coefficient, which is determined according to type and size of a particular ship.

The standard CGT system was developed in 1977 by the OECD so that inter-country shipbuilding output could be reasonably compared, as different types of ships require a greater or lesser degree of work relative to their gross tonnage. For example, passenger ferry of a given size would require substantially more work to build than a bulk carrier of the same size due to the differing design requirements, internal structure, and required level of detail, but simply comparing the gross tonnage or deadweight of each ship would incorrectly show that they took the same amount of work. When expanded on a national scale, this difference could greatly mislead people as to the actual maritime production capacity of a given country.

The formula to calculate CGT was revised by the OECD in 2007.

References

Stopford, Martin (1997). Maritime Economics (2nd ed.). Routledge. pp. 525–526. ISBN 978-0-415-15309-6.

External links

OECD: CGT system 2007 Revision of 2007 and calculation formula

Ship measurements

Length

Breadth

Beam

Depth

Volume

Worldwide	Tonnage Gross tonnage Compensated gross tonnage Net tonnage

Specialized	Panama Canal/Universal Measurement System Thames measurement tonnage

Archaic	Gross register tonnage Net register tonnage

Capacity

Current	Deadweight tonnage Twenty-foot equivalent unit (Intermodal containers)

Archaic	Builder's Old Measurement (sailing vessels) Moorsom System (steamships)

Weight

Displacement
Loaded displacement
Standard displacement
Light displacement
Normal displacement

Stability

Limits

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