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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As is

In the condition in which the subject matter is. This expression is used when goods, or a ship, are offered for sale without repair or rectification.

As is, where is

In the condition in which the subject-matter is and at the place where it is lying. This expression is used where goods or a ship, are offered for sale without repair or rectification and with delivery to the purchaser being at the place where the goods are lying.

ASEAN

Association of south-east Asian Nations

ASF

Asian Shipowners'' Forum

ASG

Acetyls Sector Group. A sector group of the Association of Petrochemicals Producers in Europe (APPE). For more information, click here.

Ash

Carbonaceous residue produced by burning crude oil and petroleum products. The industry tests fuels and other hydrocarbon mixtures in order to determine how much of this combustion by-product will form in ordinary use of its products. Refiners and others also use ash yield to deduce the presence of metallic soaps, abrasive solids, and other ash-causing contaminents in hydrocarbon mixtures.

Asphalt

A mixture of heavy carbon-based compounds containing a high percentage of multiple-ring aromatics, many of them involving sulfur, nitrogen, and oxygen atoms. Some folks use the word, asphalt, interchangeably with bitumen, the name of its characteristic constituent.

Asphalt cement

A derivative, nearly or completely solid at room temperature, of certain crude oils. This black, tarry material usually comes from vacuum residue. It has several industrial applications. Pavers heat it to liquid form and mix in gravel to make road surface materials called blacktop, macadam, tarmac, or "asphalt". Builders use it to make and join bricks, to coat roofs, and to form shingles. It glues together various manufactured goods.

Asphalt/Bitumen Tanker

A tanker for the bulk carriage of asphalt/bitumen at temperatures between 150 and 200 deg C

Asphaltenes

Complex molecules which reveal their ring-structures by dissolving in aromatic liquids but not in paraffins. These compounds may influence the burning and blending characteristics of residual oils, if present in sufficient concentrations. They contribute to the high melting temperature and adhesion of bitumen and asphalt cement.

ASPW

Any Safe Port in the World

Assay

An elaborate laboratory report describing in detail the quality of grades of crude oil. The data presented includes, among other items, density, sulfur, naphthenicity, pour point, viscosity, distillation, and information on the quality of individual fractions. They tell a refiner what products he can make from a specific crude.

Assignment

A term commonly used in connection with a bill of lading. It involves the transfer of rights, title and interest in order to assign goods by endorsing the bill of lading.

Associated gases

Associated gas is an emulsion produced from saturated crude oil (a) Behind a vessel (b) Move in a reverse direction.

Astern

Behind a vessel. Move in a reverse direction.

ASTM

American Society for Testing and Materials. An organization which determines and publishes consensus standards of suitability and quality for a wide variety of materials including petroleum and refined products. ASTM develops and endorses methods of testing hydrocarbons properties as well as definitive specifications for such classes of refined product as fuel oils, aviation kerosene, burning kerosene, and motor gasoline.

At Loggerheads

An iron ball attached to a long handle was a loggerhead. When heated it was used to seal the pitch in deck seams. It was sometimes a handy weapon for quarrelling crewmen.

ATA

Actual Time of arrival

ATC

Actual time counting

ATD

Actual time of departure

ATDN

Any Time Day or Night. Term used in a time Charter-Party to signify that the shipowner may deliver the ship or that the charterer may redeliver the ship, as the case may be, at any time of the day or night and not necessarily during normal working hours. This term is very often followed by SHINC (Sundays and holidays included).

ATDNSHINC

Any Time Day or Night Sundays and Holidays Included. Term used in a time Charter-Party to signify that the shipowner may deliver the ship or that the charterer may redeliver the ship, as the case may be, at any time of the day or night and not necessarily during normal working hours. This term is very often followed by SHINC (Sundays and holidays included).

ATDON

At day or night

Athwartships

A direction across the width of a vessel.

ATL

Atlantic Ocean. The Atlantic Ocean and the ports and seas surrounding it, including the eastern seaboard of the United States and Canada, the U.S. Gulf and Caribbean Sea, the northern and eastern coasts of South America, the North Sea, the Black Sea and the Mediterranean Sea.

Atlantic basin

The Atlantic Ocean and the ports and seas surrounding it, including the eastern seaboard of the United States and Canada, the U.S. Gulf and Caribbean Sea, the northern and eastern coasts of South America, the North Sea, the Black Sea and the Mediterranean Sea.

Atmos

Abbreviation of atmospheric-pressure distillation, as in atmos bottoms and atmos gasoil.

Atmospheric corrosion

Corrosion with the earth's atmosphere at ambient temperature as the corrosive environment

Atmospheric corrosion test

Field trials in the atmosphere

Atmospheric distillation

A technique for separating hydrocarbon mixtures which uses distillation apparatus operated at atmospheric pressure. Generally, the industry specifies ambient pressure to distinguish products of crude distillers, atmospheric fractions, from the products of vacuum flashers which, as the name implies distill atmospheric residue in a partial vacuum.

Atmospheric gasoil

The heaviest product boiled by a crude distillation unit operating at atmospheric pressure. This fraction ordinarily sells as distillate fuel oil, either in pure form or blended with cracked stocks. In blends atmospheric gasoil, often abbreviated AGO, usually serves as the premium quality component used to lift lesser streams to the standards of saleable furnace oil or diesel engine fuel. Certain ethylene plants, called heavy oil crackers, can take AGO as feedstock.

Atmospheric residue

The portion of crude oil taken as a bottoms product in a crude distillation unit which operates at atmospheric pressure under several other names apply to this product including atmos (atmospheric) reside, atmos bottoms, atmospheric fuel oil long reside, straight-run heavy fuel oil and topped crude.

ATN

Aids to Navigation

Atom

The smallest unit into which matter can be divided without the release of electrically charged particles, and also the smallest unit of matter that cannot be decomposed into simpler substances by ordinary chemical processes. Hence the atom is the basic building block of chemistry. Atoms, also called chemical elements, can combine with one another to form compounds.

ATRS

American Tank Rate Schedule

ATS

Actual Time Saved or All time saved. Term used in a voyage charter party to define one method by which despatch money is calculated, that is, by deducting time used for loading and/or discharging, as the case may be, from a theoretical time up to the expiry of laytime which includes excepted periods, for example a charterer may be allowed 10 days for loading. He calculates the expiry of laytime taking, account of excepted periods such as weekends, and arrives at a theoretical number of calendar days, say 15. Should he only use four laydays to load, he is entitled to II days despatch money.

ATSB or ATSBE

All time saved both ends

ATSDO

All time saved discharging only

Attack Vessel, Naval

A combat vessel which is designed for high speed with a limited weaponry for rapid attack manoeuvres

ATUTC

Actual Times Used to Count

Auditing

The process carried out to assess the operating standards of a company or a business and the degree of compliance.

AUSSIE

Australia

Auto Oil programme

A technical work programme launched in 1992 by the European Commission and in which the European automobile and oil industries participated. The aim of this programme was to assess the most cost-effective measures for reducing emissions from the road transport sector to a level consistent with the EU air quality standards. Several petrochemical sectors have been involved in this process. Some measures have already been implemented; a further set of restrictions will be implemented by 2005.

Automated Identification System (AIS)

It is a system used by ships and Vessel Traffic Service (VTS) principally for the identification and the locating of vessels. AIS provides a means for ships to electronically exchange ship data including: identification, position, course, and speed, with other nearby ships and VTS stations.

AUX

Auxiliary

AV

Ad valorem

Availability

A quantity of crude or product a supplier could sell

AVCAT

Aviation Category

Average

See Insurance.

Average to Laytime

As a voyage charterer, to offset the time used in loading cargo against that used in discharging for the purpose of calculating demurrage or despatch. If, for example, a charterer earns five days despatch at the loading port but there is a period of three days demurrage at the discharging port, the charterer has a net claim for two days despatch money.

AVGAS

Aviation Gasoline

Aviation gasoline

High-grade motor fuel blended to meet the requirements of piston-type aero plane engines. This specialty product differs in all critical respects from aviation turbine fuel (jet).

Aviation turbine fuel (ATF)

The fuel burned by aero planes jet engines. Civilian aircrafts consumes a kerosene-range product variously known as jet kero, jet A-1, avtur, DERD-2494, and JP1. Warplanes needed special fuels. Two military grades, JP-4 and JP-5 fall within the common notion of AFT.

Avoirdupois Pound

Same as 0.4535924277 kilograms.

AWB

Air waybill : Shipping document specifying terms for the courier and instructions for the airline.

AWES

Association of Western European Shipbuilders

AWH

Available workable hatches

AWIWL

Always Within Institute Warranty Limits

AWRI

Additional War Risk Insurance

AWTSBE

All working time saved both ends

AWTSDO

All working time saved discharging only

AWTSLO

All working time saved loading only

AWWL

Always within Institute Warranties Limits (Insurance purpose).

B

Bale (used for cargo capacity)

B OR BM

Beam

B TO B

Both to blame (collision clause)

B.D.S.

Brokers daily statement

B.H.(range)

Range of ports between and including Bordeaux & Hamburg

B.O.

Broker's Order or Buyer's Option

B.P.

Between Perpendiculars or Boiling Point

B.S. & W.

Bottom (or base) sediment and water

B/D

Below Deck

B/D

Bar draught or Banker's draft or Barrels per day

B/E

Break Even

B/E

Bill of Exchange or Bill of Entry

B/E or BENDS

Both ends

B/F

Brought forward

B/G

Bank Guarantee

B/H

Bill of health

B/H

Bordeaux/Hamburg range of ports or Barrels per hour

B/L

Bale

B/N

Booking note

B/O

Bulk/oil carrier

B/P

Bill payable or Brake power

B/R

Bordeaux/Rouen or Bill Receivable

B/S

Bill of Sale or Bill of Store or Boiler Survey

B4

Before

BA

British Admiralty or Buenos Aires or Bale (cap. of vessel) or Breathing apparatus or Bunker Surcharge

BA/BB

Buenos Aires/Bahia Blanca Range

BACAT

Barge aboard catamaran

Back and Fill

A technique of tacking when the tide is with the ship but the wind is against it.

Backhaul

A tanker's revenue-producing return voyage. Some ships shuttle between two tankers ports. They travel in one direction as dictated by normal oil flow patterns or refining system's needs. Often, they have no natural employment from when they discharge to their port of origin where another load awaits. They would like to find a cargo to pay their costs on this return trip. Otherwise, they must return in ballast. Charters often relet ships at bargain back haul rates for these voyages. They prefer some income to none.

BACTAP

But As Close To As Possible

BAF

Bunker Adjustment Factor

Baking or Frying Fats (Shortening)

Baking or frying fats are products which meet all of the following conditions - a. manufactured from vegetable oils, meat fats or marine oils, singly or in combination; b. deodorised or hydrogenated and deodorised; c. containing a significant amount of glycerides solid at room temperature, and d. produced and sold entirely or primarily for baking or frying purposes.

BAL

Balance

Bale Capacity

Bale Capacity -cargo ship space

Ballast

Water taken aboard a vessel to increase its draft, steady its motion, correct its trim, or otherwise make it more seaworthy when sailing without cargo. The trade uses this word to describe repositioning voyages or empty backhauls forced on ship. Hence, phrases appear like "ballasting Trans-Atlantic"

Ballast Bonus

Special payment above the Chartering price when the ship has to sail a long way on ballast to reach the loading port.

Balloon Freight

Light, bulky articles.
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