Maritime Terms, Abbreviations and Acronyms

Maritime abbreviations and acronyms go back to those days we used telegram and telex to communicate. The business model for telex and telegrams was “pay per letter”. Even though the telegrams and telexes have been retired, we still use the maritime abbreviations daily.

Below you will find a comprehensive list of terms, abbreviations, and acronyms used in the maritime industry, sorted in alphabetical order. You can search for an acronym or write a word and find the abbreviations where the word is included.

If you think some abbreviations are missing, send us an e-mail at post@maritimeoptima.com or open the chat icon on the bottom of this page.

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True Colors

The current meaning, ‘to reveal yourself as you really are’, actually came about because of the opposite phrase “false colors” – from the 17th century referring to a vessel which sailed under a flag not her own. This tactic was used by almost everyone as a ruse de guerre, but the rules of gentlemanly behavior (and possibly actual legal rules) required one to raise one’s true colors before opening fire on another ship.

True Draft

Ship Stability: Where the waterline intersects the forward and after perpendiculars.

Trust Receipt

Release of merchandise by a bank to a buyer while the bank retains title to the merchandise. The goods are usually obtained for manufacturing or sales purposes. The buyer is obligated to maintain the goods (or the proceeds from their sales) distinct from the remainder of the assets and to hold them ready for repossession by the bank.

Try a Different Tack

The direction in which a ship moves as determined by the position of its sails and regarded in terms of the direction of the wind (starboard tack). If one tack didn’t bring the ship up properly, one could always attempt another.

TS

Time at Sea or Tons

TSG (C)(G)

Tanker Safety Guide (Chemicals) and (Gas) (ICS)

TSP

Triple super phosphate

TSS

Twin screw ship

TST

Topside tank

TT

Turn Time or Telegraphic Transfer or That or TankTop

TTBE

Turn Time Both Ends

TTL

Total

TUB

Tubarao

Tug

A powerful small boat designed to pull, push or manuever vessels.

Tug, Naval Auxiliary

A tug for naval support

Tugboat / Ocean Towing

Tugboats are used to pull ortow barges on the ocean or on wider inland rivers that have rough waters. Ocean towing involves long towlines between the tugboat and tow, to provide the necessary slack to accommodate rough water and varied weather conditions. Oceangoing tugs are very large and very powerful.

Turn a Blind Eye

From Admiral Lord Nelson’s awesome display of badassery at the Battle of Copenhagen. When the signal was given to stop fighting, Nelson held his spyglass to his blind eye and insisted he didn’t see the signal. He then proceeded to kick butt, of course.

Turnaround

In water transportation, the time it takes between the arrival of a vessel and its departure.

Turning Basin

An area that provides for the turning of a ship (bow to stern). Turning basins are usually located at or near the upper end of the interior channel and possibly at one or more intermediate points along long channels (EM 1110-2-1613).

Turret

An attachment for a Floating Storage and Offtake vessel or Floating Production, Storage and Offloading vessel that allows vessel to rotate around its mooring according to direction of wind and current.

TV

Time volume

TVE

Tank Vessel Examination (USCG)

TVP

True Vapor Pressure. The absolute pressure exerted by the gas produced by evaporation from a liquid, when the gas and liquid are in equilibrium at the prevailing temperature.

TW

Tween Deck (OCIMF acronym)

TW

Twin Decker