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Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%Dry Bulk Freight Index2,667▼ -4.8%Dirty Tanker Index7,727▼ -0.0%Capesize3,630▼ -9.1%Clean Tanker Index2,522▲ +0.0%Panamax2,409▼ -0.9%Supramax1,845▲ +0.7%Handysize1,003▲ +0.3%
Reference, A to Z

Maritime Dictionary

The full A to Z reference of maritime and shipping terminology: nautical terms, abbreviations and industry definitions, by letter and by topic. Each entry is defined in one paragraph and linked to related terms and to the desks that work with it.

Entries updated May 2026

202
terms defined

The curated primer. The Glossary explains the core chartering, S&P, operations and compliance terms in plain English, each linked to where we measure it.

Open the Glossary

A

10 terms

B

18 terms
Ballast TankTanks within a vessel's hull that can be filled with or emptied of seawater to adjust the vessel's trim, stability, and draft.Ballast Water TreatmentSystems installed on vessels to treat ballast water before it is discharged overboard, removing or neutralising harmful aquatic organisms and pathogens.Bareboat CharterA charter party agreement in which the shipowner provides only the vessel without crew, provisions, or insurance.BareconA standard bareboat charter party form published by BIMCO, widely used in the shipping industry for bareboat or demise charter agreements.BeamThe width of a vessel at its widest point, measured at the midship section.BearingThe horizontal direction of one point from another, measured clockwise from true north, magnetic north, or the heading of a vessel.Beaufort ScaleA scale of wind force ranging from 0 (calm) to 12 (hurricane force) developed by Rear Admiral Sir Francis Beaufort in 1805.BerthA designated location in a port or harbour where a vessel is moored for loading, discharging, or other operations.BilgeThe lowest internal part of the hull where the sides curve inward to meet the bottom.Bill of LadingA legal document issued by a carrier or its agent to a shipper that serves as a receipt for cargo, evidence of the contract of carriage, and a document of title to the goods.BollardA strong vertical post on a ship's deck or on a quay used for securing mooring lines.BowThe forward-most part of a vessel's hull, designed to reduce the resistance of the hull cutting through water.Bow ThrusterA transverse propulsion device installed in a tunnel through the bow of a vessel, used to improve manoeuvrability at low speeds during berthing and unberthing operations.Break BulkCargo that is shipped as individual pieces or packages rather than in containers, including items such as steel, lumber, project cargo, heavy machinery, and bagged goods.BridgeThe command and navigation center of a vessel, typically located on the uppermost deck of the superstructure, providing a clear view forward and to both sides.Bulk CarrierA merchant vessel designed to transport unpackaged bulk cargo such as grain, coal, ore, and cement in its cargo holds.BulkheadA vertical partition wall within a vessel's hull that divides the interior into separate compartments.BunkerMarine fuel used to power a vessel's main engines and auxiliary machinery.

C

21 terms
CIFCost, Insurance and Freight, an Incoterm under which the seller delivers the goods on board the vessel and pays the cost of freight and marine insurance to the named destination port.CIICarbon Intensity Indicator, an operational measure introduced by the IMO that rates a ship's annual carbon emissions relative to the cargo carried and distance sailed.COAContract of Affreightment, a long-term agreement between a shipper and a shipowner to transport a specified quantity of cargo over a given period, with individual shipments made on vessels nominated by the owner.Cable LayerA specialised vessel designed to lay submarine cables on the seabed, including telecommunications cables and power cables for offshore wind farms.CabotageThe restriction of commercial shipping operations within a country's coastal waters to vessels flying the national flag.CapesizeA large dry bulk carrier, typically between 100,000 and 200,000 DWT, too large to transit the Suez or Panama Canals and therefore routed around the Cape of Good Hope or Cape Horn.Car CarrierA specialised Ro-Ro vessel, also known as a Pure Car Carrier (PCC) or Pure Car and Truck Carrier (PCTC), designed to transport automobiles and light vehicles.Cargo HoldAn enclosed space within a vessel's hull designed for the stowage of cargo.ChandlerA ship chandler is a supplier of provisions, stores, and equipment to vessels in port.Chart DatumThe reference level from which depths on a nautical chart are measured, typically the lowest astronomical tide (LAT).Charter PartyA contract between a shipowner and a charterer for the hire of a vessel or part of its cargo space for a specified voyage, period of time, or on a bareboat basis.Chemical TankerA specialised tanker built to transport liquid chemicals in bulk, fitted with coated or stainless-steel cargo tanks and sophisticated cargo-handling systems.Classification SocietyAn organization that establishes and maintains technical standards for the construction and operation of ships and offshore structures.Collision RegulationsThe International Regulations for Preventing Collisions at Sea (COLREGS), a set of rules published by the IMO that establish navigation protocols for vessels to follow in order to avoid collisions.Compass RoseA graduated circle printed on nautical charts showing both true and magnetic north, used to determine bearings and courses.Container ShipA cargo vessel designed exclusively to carry intermodal containers in a cellular structure, ranging from small feeder ships of a few hundred TEU to ultra-large container vessels exceeding 24,000 TEU.ContainerizationThe system of transporting goods in standardised intermodal containers that can be efficiently transferred between ships, trucks, and rail cars without handling the cargo itself.CourseThe intended horizontal direction of travel measured as an angle from north.Course Over GroundThe actual direction of a vessel's movement over the earth's surface, as determined by GPS or other positioning systems.CustomsThe government authority responsible for controlling the import and export of goods at ports, collecting duties and taxes, and enforcing trade regulations.CycloneA general term for a tropical cyclone occurring in the South Pacific or Indian Ocean, characterised by an organised system of clouds and thunderstorms with a defined low-pressure centre and sustained winds of 64 knots or greater.

D

13 terms
DSCDigital Selective Calling, a semi-automated method of establishing a radio call using digital codes transmitted on VHF, MF, and HF radio frequencies.Dead FreightA charge payable by the charterer for the unused cargo space when the agreed quantity of cargo is not provided for loading.Dead ReckoningA method of estimating a vessel's current position by advancing a known position using the course steered, speed through the water, and time elapsed.Deadweight TonnageThe total weight a vessel can carry, including cargo, fuel, fresh water, ballast water, provisions, passengers, and crew, measured in metric tonnes.DemurrageA charge payable by the charterer to the shipowner when a vessel is detained in port beyond the agreed laytime allowed for loading or discharging cargo.DispatchA financial reward paid by the shipowner to the charterer when a vessel completes loading or discharging in less than the agreed laytime.DoldrumsThe equatorial region of calm or light variable winds between the northern and southern trade wind belts, also known as the Intertropical Convergence Zone (ITCZ).DraftThe vertical distance between the waterline and the lowest point of a vessel's hull, indicating how deep the ship sits in the water.Draft SurveyA method of determining the weight of cargo loaded or discharged from a vessel by reading the vessel's draft marks before and after cargo operations.DraughtThe British English spelling of draft, referring to the depth of water a vessel draws.DredgerA vessel equipped with machinery for excavating and removing sediment from the seabed or riverbed to maintain navigable waterways, deepen ports, and reclaim land.Dry DockingThe process of placing a vessel in a dry dock for inspection, maintenance, repair, and painting of the underwater hull.Dual FuelAn engine technology that allows a marine engine to operate on two different types of fuel, typically LNG and conventional marine diesel or heavy fuel oil.

E

5 terms

F

12 terms
FEUForty-foot Equivalent Unit, a measure of container capacity equal to two TEU, based on the standard 40-foot intermodal container.FOBFree On Board, an Incoterm under which the seller delivers the goods on board the vessel nominated by the buyer at the named port of shipment.FPSOFloating Production Storage and Offloading unit, a vessel used by the offshore oil and gas industry for the production, processing, and storage of hydrocarbons.FairwayThe main navigable channel in a harbour, river, or approach to a port, typically marked by buoys, beacons, and leading lights.FetchThe uninterrupted distance of open water over which wind blows in a constant direction, directly affecting the size and energy of waves generated.Fire DrillA mandatory practice exercise conducted at regular intervals on board ship to train crew members in fire prevention, detection, and firefighting procedures.Flag SignalsA system of communication using coloured flags flown from a vessel's mast or signal halyard, each representing a letter of the alphabet, a numeral, or a specific meaning.Flag StateThe country in which a vessel is registered and whose flag it flies.ForecastleThe forward section of the upper deck of a vessel, typically raised above the main deck level, where the anchor windlass, mooring equipment, and chain lockers are located.Four-Stroke EngineA type of internal combustion engine that completes a power cycle in four strokes of the piston (two revolutions of the crankshaft).Freight RateThe price charged by a carrier for the transportation of cargo from origin to destination, expressed per tonne, per container (TEU/FEU), or as a lump sum.FunnelThe smokestack or exhaust uptake on a vessel through which engine exhaust gases are discharged to the atmosphere.

G

6 terms

H

6 terms

I

6 terms

J

1 term

K

2 terms

L

15 terms
LNG CarrierA specialised tanker designed to transport liquefied natural gas at approximately minus 162 degrees Celsius.LNG FuelLiquefied natural gas used as a marine fuel to power ship engines, offering significant reductions in sulphur oxides, nitrogen oxides, and particulate matter emissions compared to conventional heavy fuel oil.LPG CarrierA specialised tanker designed to transport liquefied petroleum gas, primarily propane and butane, either under pressure, refrigerated, or a combination of both.LRITLong Range Identification and Tracking, an international system for tracking vessels globally, adopted by the IMO as an amendment to SOLAS.LashingThe process of securing cargo aboard a vessel using chains, wires, ropes, turnbuckles, and other fittings to prevent movement during the voyage.LatitudeThe angular distance of a point north or south of the equator, measured in degrees, minutes, and seconds from 0 degrees at the equator to 90 degrees at the poles.Lay DaysThe range of dates within which a vessel must arrive at the loading port and present notice of readiness to the charterer.LaytimeThe period of time agreed in the charter party during which the shipowner makes the vessel available for loading or discharging cargo without additional charge.Lee ShoreA shore that lies downwind of a vessel, toward which the wind is blowing.LeewayThe sideways drift of a vessel from its intended course, caused by wind pushing against the hull and superstructure.Letter of CreditA financial instrument issued by a bank on behalf of a buyer guaranteeing payment to the seller upon presentation of specified shipping documents, including the bill of lading.Life RaftAn inflatable or rigid survival craft that provides emergency flotation for persons abandoning ship.LifeboatA rigid survival craft carried on board a vessel to evacuate crew and passengers in an emergency.Limitation of LiabilityA legal principle in maritime law that allows a shipowner to limit the amount of their financial liability for claims arising from maritime incidents.LongitudeThe angular distance of a point east or west of the Prime Meridian at Greenwich, measured in degrees from 0 to 180.

M

14 terms
MARPOLThe International Convention for the Prevention of Pollution from Ships, the main international convention covering prevention of pollution of the marine environment by ships from operational or accidental causes.MLCThe Maritime Labour Convention, adopted by the International Labour Organization (ILO) in 2006, which sets out seafarers' rights to decent conditions of work across a wide range of subjects.Magnetic NorthThe direction indicated by a magnetic compass needle toward the earth's magnetic north pole, which differs from true north by an angle called magnetic variation or declination.Main EngineThe primary propulsion machinery of a vessel, responsible for driving the propeller.Man OverboardAn emergency situation in which a person has fallen from a vessel into the water, commonly referred to by the abbreviation MOB.ManifestA comprehensive document listing all cargo carried on a vessel for a particular voyage, including descriptions, quantities, weights, shippers, and consignees.Maritime LienA privileged claim against a vessel arising from maritime services rendered to the ship or damage caused by the ship.MastA vertical pole or structure rising above the deck of a vessel, used to support navigation lights, radar scanners, communication antennas, and signal flags.MaydayThe internationally recognised voice radio distress signal, spoken three times at the beginning of a radio distress call to indicate that a vessel, aircraft, or person is in grave and imminent danger and requires immediate assistance.MeridianA great circle on the earth's surface passing through both the North and South Poles.MonsoonA seasonal prevailing wind in the Indian Ocean and southern Asia that brings heavy rainfall during summer months.Mooring LinesHeavy ropes or wires used to secure a vessel to a berth, buoy, or another vessel.Morse CodeA communication system using sequences of short and long signals (dots and dashes) to represent letters and numbers.Muster StationA designated assembly point on board a vessel where crew and passengers must gather during an emergency drill or actual emergency.

N

3 terms

O

1 term

P

12 terms
P&I ClubProtection and Indemnity Club, a mutual insurance association that provides cover for its shipowner and charterer members against third-party liabilities arising from the operation of ships.Pan-PanAn internationally recognised urgency signal, spoken three times at the beginning of a radio message, indicating that there is an urgent situation on board a vessel but no immediate danger to life or the vessel.PanamaxThe largest vessel size that can transit the original Panama Canal locks, with maximum dimensions of approximately 294 metres length, 32.3 metres beam, and 12.04 metres tropical freshwater draft.ParallelA circle on the earth's surface formed by the intersection of a plane parallel to the equator.Permit to WorkA formal documented procedure used to control high-risk work activities on board a vessel, such as hot work, work at height, and electrical isolation.PilotA licensed mariner with extensive local knowledge who embarks on a vessel to advise the master on safe navigation through restricted waters, harbour approaches, and during berthing and unberthing operations.Poop DeckThe raised deck at the stern of a vessel, forming the roof of the aft accommodation or steering gear compartment.Port (Direction)The left-hand side of a vessel when facing forward (toward the bow).Port State ControlThe inspection of foreign-flagged ships in national ports to verify that the condition of the vessel and its equipment complies with the requirements of international conventions.Post-PanamaxAny vessel too large to transit the original Panama Canal locks but able to pass through the expanded Neopanamax locks opened in 2016.Product TankerA tanker designed to carry refined petroleum products such as gasoline, diesel, jet fuel, and naphtha.PropellerA rotating device with blades mounted on a shaft that converts engine power into thrust to propel the vessel through the water.

Q

1 term

R

4 terms

S

27 terms
SARSearch and Rescue, the coordinated effort to locate and recover persons in distress at sea, involving maritime rescue coordination centres (MRCCs), coast guard units, naval vessels, and commercial ships.SARTSearch and Rescue Transponder, a portable radar beacon used to assist rescue services in locating survivors at sea.SOLASThe International Convention for the Safety of Life at Sea, the most important international treaty concerning the safety of merchant ships.SOPEPShipboard Oil Pollution Emergency Plan, a mandatory document carried on all oil tankers of 150 gross tonnage and above and all ships of 400 gross tonnage and above.STS CraneShip-to-Shore crane, a type of gantry crane specifically designed for loading and discharging containers between vessels and the quay.Safety Management SystemA structured and documented system enabling company personnel to effectively implement the corporate safety and environmental protection policy.SalvageThe rescue of a vessel, its cargo, or other property from peril at sea, for which the salvor is entitled to a reward.ScrubberAn exhaust gas cleaning system (EGCS) installed on ships to remove sulphur oxides (SOx) and particulate matter from engine exhaust gases, enabling the use of high-sulphur fuel oil while meeting MARPOL Annex VI emission limits.Sea StateA description of the condition of the sea surface with respect to wave and swell characteristics, categorised using the Douglas Sea Scale from 0 (calm, glassy) to 9 (phenomenal, waves over 14 metres).SecuriteAn internationally recognised safety signal, spoken three times at the beginning of a radio message, used to broadcast important navigational or meteorological warnings to all vessels in the area.ShaftThe rotating mechanical component that transmits power from the main engine to the propeller.Shaft GeneratorAn electrical generator driven by the main engine through the propeller shaft, used to produce electrical power while the vessel is at sea.Ship ReportingMandatory or voluntary systems requiring vessels to report their position, course, speed, and other information to shore-based authorities when entering or transiting designated areas.Speed Over GroundThe speed of a vessel relative to the earth's surface, as measured by GPS or other positioning systems.Spot RateThe current market price for chartering a vessel or shipping cargo for immediate or near-term loading, as opposed to long-term contract rates.Spring TideThe tide with the greatest range between high and low water, occurring approximately every two weeks when the sun, moon, and earth are aligned during new and full moon phases.StarboardThe right-hand side of a vessel when facing forward (toward the bow).SternThe rear-most part of a vessel's hull where the rudder and propeller are typically located.Stern TubeA watertight tube through which the propeller shaft exits the hull at the stern of the vessel.StevedoreA company or individual responsible for the loading and discharging of cargo from vessels in port.Storm SurgeAn abnormal rise in sea level generated by a storm's winds and low atmospheric pressure, over and above the predicted astronomical tide.Stowage FactorThe volume in cubic metres or cubic feet occupied by one metric tonne of a particular cargo when stowed in a vessel's hold.SuezmaxThe largest vessel size capable of transiting the Suez Canal in a laden condition, typically between 120,000 and 200,000 DWT with a maximum beam of about 50 metres and a draft limit of approximately 20.1 metres.SupercargoA person employed by the cargo owner or charterer to travel on a vessel and oversee the loading, stowage, care, and discharge of the cargo.SuperstructureThe enclosed structure built above the main deck of a vessel, housing the bridge, accommodation, galley, and other operational spaces.SupramaxA dry bulk carrier with a deadweight tonnage between 50,000 and 65,000 DWT, usually fitted with cranes capable of handling 30 tonnes or more.SwellLong-period ocean waves generated by distant weather systems that travel far from their origin, distinct from wind waves generated by local conditions.

T

14 terms
TEUTwenty-foot Equivalent Unit, a standard measure of container ship capacity based on the dimensions of a standard 20-foot intermodal container (approximately 6.1 metres long, 2.44 metres wide, and 2.59 metres high).TankerA vessel designed to transport liquid cargo in bulk, including crude oil, refined petroleum products, chemicals, and vegetable oils.TerminalA specialised facility within a port designed for the handling of a specific type of cargo or vessel.Tidal RangeThe vertical difference between the highest high tide and the lowest low tide at a particular location.Time CharterA charter party agreement in which the shipowner provides a manned and equipped vessel to the charterer for a specified period.Tonnage CertificateAn official document issued by a classification society or flag state authority certifying a vessel's gross tonnage (GT) and net tonnage (NT) as measured under the International Convention on Tonnage Measurement of Ships (1969).Trade WindsPersistent easterly winds that blow from the subtropical high-pressure belts toward the equatorial low-pressure belt, from the northeast in the Northern Hemisphere and the southeast in the Southern Hemisphere.TransitThe passage of a vessel through a canal, strait, or narrow waterway.True NorthThe direction along the earth's surface toward the geographic North Pole, as opposed to magnetic north.TsunamiA series of ocean waves with extremely long wavelengths caused by large-scale disturbances of the ocean floor, typically from undersea earthquakes, volcanic eruptions, or submarine landslides.TugA powerful, compact vessel designed to assist larger ships by towing or pushing them during berthing, unberthing, and manoeuvring in ports and confined waterways.Tug AssistThe use of tugs to assist a vessel during manoeuvring in confined waters, berthing, and unberthing operations.Two-Stroke EngineA type of internal combustion engine that completes a power cycle in two strokes of the piston (one revolution of the crankshaft).TyphoonA mature tropical cyclone that develops in the western North Pacific Ocean, characterised by sustained wind speeds of 64 knots (119 km/h) or greater.

U

2 terms

V

4 terms

W

5 terms