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Glossary term Description
unit loads

Unit loads are parts of a shipment that can be treated as a single unit during cargo handling and transportation. The most common unit loads are pallets and components with bases that resemble pallets. The most important properties of a unit load are that it can be loaded to ensure a tight fit, its modularity and its stability, the last of which ensures that it can be stowed safely and will not be damaged by load securing measures.

UNCTAD Code Now known as UN/LOCODE. UNCTAD is the United Nations Conference on Trade and Development.

United Nations Conference on the Law of the Sea


ultra-large crude carrier: 320,000+ dwt 


under-keel clearance. Allowance made to ensure a certain clearance between the ship's bottom and the seabed. See also DUKC.


ultra-high frequency. Portable radio sets capable of sending and receiving signals between different areas on board large steel vessels

twist lock A securing mechanism for securing containers in a vertical direction; twist locks are placed between the containers and fastened in the oblong holes on the container corners.
Turnbuckle Tightening elements made up of two threaded rods, a threaded barrel and a lever, usually in the form of a ratchet. Turnbuckles are the preferred tensioning method when securing loads with chains.

trailer suction hopper dredger


Taking cargo from one ship and loading it on to another. Often done at a transhipment hub - a port capable of accommodating a large ship, from which it is loaded on to smaller vessels that can access other nearby ports.