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

Dry cargo vessel of 50,000-59,999 dwt, taking over from Handymax where size permits.

SWATH Short Waterplane Area Twin Hull, a new hull technology using the catamaran principle, usually for high speed ferries.

safe working load


A ship lift

tank container A large container essentially comprising an ISO frame in which liquid containers are mounted. They must meet special requirements with respect to pressure-resistance as a result of the pressures they have to withstand. For this reason, the actual containers are generally cylindrical or spherical in form. Several containers can be mounted either horizontally or vertically in a single frame. Only specific containers must be used for foodstuffs and must be marked "Potable liquids only". Tank containers for hazardous goods must meet the requirements of the IMDG code. Half-height tank containers serve to carry high-density liquids which cannot be carried in normal tank containers because they cannot be filled to a high enough level and are therefore subject to surging.
tbp Tonnes bollard pull (tugs)

(The European Union) Trans-European Network for Transport


Twenty-foot equivalent unit - the general term used to describe container capacity or traffic figures


Rise and fall of the water level in a particular place. Tides have an approx cycle of 12 hours and are affected by the Moon's phase and position relative to the Sun and Earth. Certain areas around the world have no appreciable rise and fall of tide, eg Mediterranean Sea. Spring tides bring about the highest high tides and the lowest low tides. Neap tides have smaller high tides and low tides compared with spring tides. All charts are reduced to the chart datum (CD), which is usually the lowest spring tide (LLWS or LAT). Drying heights are the distance an object projects out of the water at CD. Charted vertical clearances are measured from mean high water springs (MHWS) and the height of a light is also measured from this level.


Layer in a container that is numbered from bottom to top