A (22) | B (29) | C (39) | D (16) | E (14) | F (27) | G (10) | H (16) | I (18) | J (1) | K (6) | L (26) | M (18) | N (8) | O (5) | P (24) | R (10) | S (45) | T (14) | U (11) | V (9) | W (6)
Glossary term Description

Deadweight tonnes. Largest amount of cargo, bunkers and stores a vessel can carry

dunnage material

Materials that are not fastened firmly to the means of transport or transport container and are used to protect the goods from sweat, dirt, or mechanical stress, for instance, or as an aid in stowage (interlayer dunnage). Depending on its application, it is referred to as floor dunnage, interlayer dunnage, lateral dunnage or top dunnage


Waste material, which is disposed of, having been used to secure cargo and packages


Dynamic under keel clearance. This is a computer model developed in Australian ports to allow maximum sailing draught for very large vessels, based on actual weather conditions, tide, current and vessel characteristics.

    A  vessel designed for use in exploratory offshore drilling of new oil and gas wells or for scientific drilling purposes

    Dynamic positioning. A system to keep a vessel in the same position automatically using GPS, computers and thrusters. Mostly seen in specialised offshore oil exploration vessels, cable layers, dredgers and, more recently, in passenger vessels

    double hull Construction of vessel with a space, usually for segregated ballast, surrounding the whole cargo hold or tank. All new tankers are required to be built as double hull vessels and all single hull tankers will not be permitted to carry heavy oil after 2010.
    double bottom Construction of vessel having a space, usually for segregated ballast, between the keel and the cargo hold or tank.

    An integrated centre which offers numerous facilities and services to companies operating in the field of distribution, example container storage areas away from a port

    displacement tonnage

    The total weight of a vessel in tonnes when loaded to its maximum summer load line. This is commonly used as the

    main tonnage value for naval warships