| Entry | Förklaring |
| a | Area, Aft |
| A | Ampere |
| A | Argentina (gl. nationsbogstav) |
| A-mast | Andet navn for Bipod-mast, se dette |
| a.b. | Able bodied, helbefaren sømand/matros |
| a.o.e. | Any One Event |
| a.o.r. | Any One Risk |
| A/Amax | Klasseselskabers betegnelse ved skibes opdrift/flydeevne med frie væskeoverflader, især om ro/ro og passagerskibe. |
| A/F | Also For (referring to port/s to be touched by ship). |
| a/o | And/or, Account of |
| a/r | All risk, against all risk |
| a/s | Alongside, after sight, account sales |
| A1 | Fist class condition |
| aa | Always afloat, Always accessible, apparent altitud |
| aaaa | Always afloat always accessible |
| aar | Against all risk, All and any risk |
| aara | Amsterdam-Antwerp-Rotterdam Area |
| AAS | Aalborg Stålkonstruktioner |
| ab | from |
| ABB | Asea Brown Boveri, producent af bl.a. elmotorer, mmm. |
| ABP | Associated British Ports |
| ABS | American Bureau of Shipping |
| abt | About |
| AC | Alternate Current (vekselstrøm) |
| Acc, a/c, act | Account |
| ACH | Ateliers & Chantiers du Havre, Frankrigs 2.største værft (1998) |
| ACID | ACoustical Imaging Development. (fjernstyringsteknik lånt fra rumfarten, kan bruges til fremstilling af nøjagtige kort over havbunden). |
| ACO | Artic Container Operation, Samarbejder med RAL: Royal Artic Line |
| ACOT | Advisory Committee on Offshore Technology |
| ACP | Area Contingency Plan |
| ad | after date |
| Ad.val | According to Value (lat. ad valorem) |
| ADB | Africa/Asian Development Bank |
| Adcom | Address Commision |
| AE | United Arab Emirates (gl. nationsbogstav) |
| AE1 | Asia-Europe One (containerrute frs Asien-Europa med store containerskibe, 6000 teu`s |
| AE1 | EU - FE, Europe - Far East, containerlinie under A.P.Møller |
| AE2 | USA - Far East incl. Shanghai, containerline under A.P.Møller/Sealand |
| aero | Aeronautical light |
| af | Advance freight |
| afaa | As Far As Applicable |
| AFC | Automatic Fixing Cone, erstatning af twist-locks på containere. |
| afdr. | afdrift |
| aff. | affarende |
| AFRA | Average Freight Rate Assessment |
| AFRASEC | Afro-Asian Orginazation for Economic Cooperation |
| Afsps | Arriving first sea pilot station (Norge) |
| Aft (eng.) | Agter |
| afv. | afvigelse |
| AG | Arabian Gulf, tidligere kaldet PG: Persian Gulf |
| AGW | All going well |
| ah | Antwerp/Hamburg range, eller Aft Hatch |
| ahk | AkselHesteKræft |
| AHL | Australian Hold ladders |
| AHTS | Arbejdsgiverforeningen for Handel & Transport |
| AID | Agency for International Development |
| AIMS | American Institute of Merchant Shipping |
| AIMU | American Institute of Marine Underwriters. |
| AIS | Automative Identification System. System der udsender skibes ID-signaler til andre radarer, VTS-anlæg osv., for identification. |
| AL | Algeria (Algeriet) (gl. nationsbogstav) |
| Al | Alternating (vekslende) |
| AL.WR | Alternating light |
| ALAMAR | Association Latinamericano de Armadores, latinamerikansk Rederforening. |
| ALP 1 | Søværnets forkortelse af: Procedures for Logistic Support Between Nato-Navies and Naval Port Information. |
| ALRS | Admiralty List of Radio Signals |
| alt | Altered, Altitude |
| alt. | altitude (højde) |
| ALU-TUCP | Phillippine Seafare`s Union |
| am | After Middnight, 0000 - 1200. lat. ante meridiem |
| Am | Amber (ravgul) |
| AMC | Aker Marine Contractors (Norsk). |
| AME-service | Asia Mediteranean Northeurpe, (container-line) |
| AMOSOP | Association of Marine Officcers and Seamens of the Philippines |
| amp. | ampere |
| AMPS | Automated Marine Propulsion Systems (hydraulisk styret fuel injector system). |
| AMSA | Australian Maritime Safety Authority |
| AMU | Arbejds Markedets Uddannelsesystem |
| AMU | Asian Maritime University (Philippinerne) |
| AMVER | Automated Mutual Assistance Vessel Rescue System |
| AN | Angola (gl. nationsbogstav) |
| AND | Andorra (se også nationsbogstav) |
| ANTHAM | Antwerp-Hamburg Range |
| ANU | Antigua (gl. nationsbogstav) |
| ANZDL | Australia New Zeeland Direct Line |
| AO | After Office (efter lukketid). |
| AODC | Association of Offshore Diving Contractors |
| aoh/a.o.h. | After Office Hours (efter lukketid) |
| AORE | Atlantic Ost Region |
| ap | Additional Premium, All Purpose, Auto Pilot |
| APL | American President Line |
| APM | A.P.Møller, Arnold Peter Møller |
| App. | apparante |
| Apprx | Approximately |
| ApS | Anpartsselskab, spøgefuldt: á prøver sgu |
| aps | Arriving Pilot Station |
| APS | Advanced Polymer Sciences (udvikling af topcoat i tanke). |
| AR | (Egypten) (gl. nationsbogstav) |
| ara | Antwerp/Rotterdam/Amsterdam - range |
| ARAG | Amsterdam-Rotterdam-Antwerp-Gent Range |
| ARAMCO | Arabian American Oil Company |
| arb | Arbitration |
| ARCC | Air Rescue Coordination Center (redningscentral) |
| ARCS | Admiralty Raster Chart Service, se også under: ECDIS |
| arnd | Around |
| ARPA | Automated Radar Plotting Aids, elektronisk hjælpesystem ved afstand/retning ved radarnavigering. |
| ArSiMa | Arbejds Sikkerheds Materiel |
| artd | After right and true delivery |
| asa | Always Safe Afloat |
| ASA | Samoa (se også nationsbogstav) |
| asap | As soon as Possible |
| ASDIC | Anta Submarine Detection Investtigation Commitee, Akustik metode til opdagelse af undervandshindringer, ubåde, o.l. |
| ASEAN | Association of South East Asian Nations |
| ASF | Asian Shipowners Forum |
| ASO | Arbejdsgiverforeningen for skib og Offshore (norsk). |
| ASPH | Automatic Seaborne Pallet Handling |
| ASRY | The Arab Shipbuilding and Repair Yard, Bahrain |
| ASW | Anti Submarine Weapons |
| ata | Actual time of Arrival |
| ATA | Automatic Tracking Aid |
| atc | Actual Time Counting |
| atd | Actual Time of Departure |
| atdn | Any Time Day or Night |
| atdnhinc | Any Time Day or Night and Holidays Included |
| ATG | Aarhus Transport Group |
| ATI-terminal | Asian Terminals Inc. (Containerterminal i Manila) se også MICT |
| atl | Atlantic |
| ATOMOS II | Advanced Technology to Optimize Maritime Operationel Safety - Integration and Interface. (EU-projekt ang. styring/logistik indenfor skibsfart). |
| ATT | Admiralty Tide Tables |
| ATUTC | Actual Times Used to Count |
| AUL | Artic Umiaq Line, tidligere KGH/KNI |
| aux | Auxillaries |
| awb | Air Way Bill |
| AWES | Association of European Shipbuilders |
| awslo | All Working Time Saved Loading Only |
| AWT | Automated Water Treatment |
| awtsbe | All Working Time Saved Both Ends |
| awtsdo | All Working Time Saved Discharge Only |
| azm. | azimut |