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.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

NESTING

Implies that cargo is presented stacked in the contour of similarly shaped cargo, it may be likened to a stack of plates

Net Tare Weight

The weight of an empty cargo–carrying piece of equipment plus any fixtures permanently attached.

Net Tonnage (NT, N.T. or nt)

A dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. NT is based on a calculation of the volume of all cargo spaces of the ship. It indicates a vessel’s earning space and is a function of the moulded volume of all cargo spaces of the ship. A commonly defined measurement system is important; since a ship’s registration fee, harbour dues, safety and manning rules etc., are based on its gross tonnage, GT, or net tonnage, NT. The net tonnage replaced the earlier net register tonnage (NRT) which denoted the volume of the ship's revenue-earning spaces in "register tons", units of volume equal to 100 cubic feet (2.83 m3). Theoretically the cargo capacity of the ship. Sometimes used to charge fees or taxes on a vessel. The formula is(0.2+0.02 log10(Vc)) Vc (4d/3D)2, for passenger ships the following formula is added: 1.25 (GT+10000)/10000 (N1+(N2/10)), where Vc is the volume of cargo holds, D is the distance between ship’s bottom and the uppermost deck, d is the draught, N1 is the number of cabin passengers, and N2 is the number of deck passen- gers.) “Ton” is figured as a 100 cubic foot ton. An approximate conversion ratio is 1NT = 1.7GT and 1GT = 1.5DWT.

Net Weight

Weight of the goods alone without any immediate wrappings, e.g., the weight of the contents of a tin can without the weight of the can.

Netback

Calculating the FOB value or price of a hydrocarbon from prices or values at delivery points. The derivation involves subtracting various costs such as freight, handling, interest, duties, transit losses, and commissions from reports or estimates of outlet-market levels.

Netlayer

A naval vessel for laying submarine nets from boom defences

Nett Terms

Opposite to Gross Terms

Neurotoxic

Capable of causing injury to the central nervous system (brain and spinal cord) and/or peripheral nervous system (nerves arising from the brain and spinal cord). Delayed neurotoxicity refers injury to the nervous system following a single exposure, but for which there is a significant latent period between exposure and the appearance of signs of a neurotoxic effect.

Neutral Body

An organization established by the members of an ocean conference acts as a self–policing force with broad authority to investigate tariff violations, including authority to scrutinize all documents kept by the carriers and their personnel. Violations are reported to the membership and significant penalties are assessed.

Neutral Oil

When a crude oil has been neutralised with an alkali, the residual material, i.e. crude oil less FFA, phosphatides, moisture and impurities, is then neutral oil.

neutral stability

Ship Stability: Exists when G coincides with M. The vessel does not tend to return to an upright position if inclined, nor to continue its inclination if the inclining force is removed.

Neutralization

The reduction of free fatty acids in a crude oil by the action of an alkali solution is ordinarily termed ""neutralisation"".

New Worldscale

The Worldscale tanker rate schedule based on revised assumptions which take effect on January 1, 1989.

Newbuilding

New ship under construction.

NEWCI

Not east of West Coast Italy

NEWCT

North East of West Coast Italy

NFPA

National Fire Protection Association. This group of fire protection personnel established a rating system used on many labels of hazardous materials. This label consists of a diamond divided into four sections representing health, flammability, reactivity, and special precautions

NG

Nigeria

NGL

Natural gas liquid

NGL

Natural gas liquids. Natural gas processing yields a variety of liquids which can range from ethane to field condensate. The specific liquids included under this designation differ from company to company and from one part of the industry to another.

NGO

Non-Governmental Organization

NHC

No heat crude

NHP

Nominal horse power

NI

Nautical Institute

NIOP

National Institute of Oilseed Products

NIOSH

National Institute of Occupational Safety and Health. This agency of the public Health Service tests and certifies respiratory and air-sampling devices. It recommends to OSHA exposure limits for hazardous substances. It also investigates incidents and researches occupational safety.

Nippon Kaiji Kyokai (NK)

A Japanese classification society which certifies seagoing vessels for compliance to standardized rules regarding construction and maintenance.

NIS

Norwegian International Ship Registry

Nitrogen Oxides (NOx)

Environmentally-harmful gases formed by the engine’s combustion process

NJ

New Jason clause in C/P

NK

Nippon Kaiji Kyokai

NK or NKK

Nippon Kaiji Kyokai

NKORL

No known or reported loss

NLS

Noxious Liquid Substance

NM

Nautical mile

NMD

Norwegian Maritime Directorate

NMFC

National Motor Freight Classification.

NMPD

Nautical miles per day

NN

Pipe Tunnel (OCIMF acronym)

NNGWB

Not north of George Washington Bridge (i.e. New York)

NNOGWB

Not North Of George Washington Bridge

NO

Number

No Great Shakes

When casks became empty they were "shaken" (taken apart) so the pieces, called shakes, could be stored in a small space. Shakes had very little value.

No oil

ASTM's grade of oil for commercial applications which benefit from heavy fuel but lack heated storage tanks. Refiners sell heavy distillate or a blend of distillate and residue as No. 4 oil. Medium-speed diesels can burn a version of this product designated No. 4-D.

No Room to Swing a Cat

The entire ship's company was required to witness flogging at close hand. The crew might crowd around so that the Bosun's Mate might not have enough room to swing his cat o' nine tails.

No-heart crude

Crude fluid enough at ambient temperature to permit transportation in vessels which cannot heat it.

No. 2 oil

ASTM's designation for distillate fuel oil intended for burning in household and light commercial furnaces. A companion grade, No. 2-D, fuels high-speed diesel engines. The USA, which relies more than other countries on ASTM specs to define oil products, generally distributes just one kind of No. 2, a dual grade suited for diesels and burners. See gasoil.

No. 5 oil

The ASTM grade of residue suitable for unheated storage in mild climates.

No. 6 oil

Heavy fuel oil too viscous for burning without preheating. See residue.

No–show

Cargo which has been booked but does not arrive in time to be loaded before the vessel sails. See also “Windy Booking.”

NOA

Not overaged

NOAA

National Oceanic and Atmospheric Administration

NOBL

Not On Banned List

NOC

Notice of cancellation

NOE

Not otherwise enumerated

NOEC

No observed effect concentration. The highest concentration of a material in a toxicity test that has no statistically significant adverse effect on the exposed population of test organisms compared with the controls. When derived from the life cycle or partial life cycle test, it is numerically the same as the lower limit of the matc. Also called no observed adverse effect level (NOAEL) or no observed effect level (NOEL).

NOGRAIN

Grain Charter Party

NOHP

Not otherwise herein provided

NOI

Not Otherwise Indexed

NOIBN

Not otherwise indicated by number, not otherwise indexed by name

NOKUS - company

Norwegian controlled foreign company in lowtax country

NOLA

New Orleans (Louisiana)

NOM

Nominations

Nomenclature of the Customs Cooperation Council

The Customs tariff used by most countries worldwide. It was formerly known as the Brussels Tariff Nomenclature and is the basis of the commodity coding system known as the Harmonized System.

Nominated Vessel

The specific vessel which has been designated for a particular voyage.

NON MECH

Non mechanical

NON REV

Non Reversible

Non-conformity

ISM definition of non-conformity: Non-conformity means an observed situation where objective evidence indicates the non-fulfilment of a specified requirement. Major non-conformity means an identifiable deviation that poses a serious threat to the safety

Non-polar

See Immiscible

NON-REVERSIBLE

then saved days will not be added to discharge time allowed.

Non–Dumping Certificate

Required by some countries for protection against the dumping of certain types of merchandise or products.

Non–Vessel Operating Common Carrier (NVOCC)

A cargo consolidator in ocean trades who will buy space from a carrier and sub–sell it to smaller ship- pers. The NVOCC issues bills of lading, publishes tariffs and otherwise conducts itself as an ocean common carrier, except that it will not provide the actual ocean or intermodal service.

Nonconjugated Fatty Acids

Polyunsaturated fatty acids exhibiting pairs of carbons separated by at least one saturated carbon atom.

NOP

Net Operating Profit or Not Otherwise Provided

NOP

Normal Operating Power (service speed)

NOPAC

North Pacific (Ports)

NOR

Not Otherwise Rated

NOR

Notice of readiness. Shall mean the notice to the charterer, shipper, receiver or other person as required by the Charter Party that the Vessel has arrived at the Port or Berth, as the case may be, and is ready to load or discharge.

NOR T & A

Notice of Readiness tendered and accepted

NORA

Notice of readiness accepted

NORT

Notice of Readiness tendered

Northern grade

Motor gasoline that meets Colonial pipeline specifications for product delivered to points north of Greensboro, North Carolina. Both distillation range and volatility differentiate Northern grade gasoline from Southern grade. Finished gasoline must be more volatile in certain states during winter months to assure proper ignition. In warm weather less volatile finished gasoline helps prevent autos from suffering vapor lock. During the months of March, May, September and November the quality specifications are the same for both Northern and Southern grades.

NOS

Not otherwise shown/specified or Numbers

Nose

Front of a container or trailer–opposite the tail.

Noxious

Harmful to personnel or the environment.

NPA

n-Propyl Alcohol

NPCFB

North Pacific Coast Freight Bureau.

NPK

Nitro Phosphatic Kompound

NPL

Norwegian policy lomits

NPRA

National Petrochemical & Refiners Association (USA)

NRAD

No risk after discharge

NRC

National Response Centre

NRT

Net Restricted Tonnage

NRT – Net Register Tons see “Net Tonnage”

Theoretically the cargo capacity of the ship. Sometimes used to charge fees or taxes on a vessel.

NS

Non-Scoring or No Sparring

NSF

Norwegian sales form

NSPF

Not specially/specifically provided for

NSPF

Not specially/specifically provided for

NSW

New South Wales (Australia)

NT

Net Tonnage or Neap Tides or Net Terms
By clicking “Accept”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. View our Cookie Policy for more information.