Water Transportation Industry Terminology

Aframax

A crude/product tanker size class of roughly 80,000–120,000 DWT optimized for regional trades where port or draft constraints limit larger ships. Often used for North Sea, Mediterranean, and short-haul Asia routes.

-“We fixed an Aframax for the Med-UKC run at WS 165.” -“The terminal’s max draft favors Aframax over Suezmax.” -“Aframax freight rallied on tighter tonnage lists.”

AIS (Automatic Identification System)

A VHF-based transponder system that broadcasts a vessel’s identity, position, course, and speed to improve situational awareness, traffic management, and collision avoidance.

-“The pilot asked for our AIS to be on Class A.” -“Port control is tracking your AIS for arrival sequencing.” -“We verified the ship’s ETA from AIS traces.”

Ballast Water Management Convention (BWMC)

An IMO convention requiring ships to manage and treat ballast water to prevent invasive species transfer, meeting D-1 or D-2 standards via onboard treatment systems.

-“The newbuild is fitted with a UV ballast system for BWMC D-2 compliance.” -“Port State Control checked our BWMS logs under the BWMC.” -“Retrofit planning must account for BWMC deadlines.”

Bareboat Charter

A charter in which the charterer takes full possession and control of the vessel—including crewing, operations, and maintenance—while paying a hire to the owner; also called “demise” charter.

-“The operator runs the ship on a bareboat basis from an owner in Greece.” -“Under bareboat, crewing is the charterer’s responsibility.” -“The vessel changes flag on bareboat delivery.”

Bill of Lading (B/L)

A core shipping document serving as receipt of goods, evidence of the contract of carriage, and document of title (if negotiable). Variants include straight, order, and seaway bills.

-“Release the cargo against the original B/L.” -“We issued a seaway bill for the express release.” -“Switch B/Ls will be arranged at the transshipment port.”

Bunker Adjustment Factor (BAF)

A surcharge applied by carriers to freight rates to account for fluctuations in marine fuel (bunker) costs.

-“Q4 BAF will increase due to higher VLSFO prices.” -“Our tender requests all-in rates, no separate BAF.” -“Negotiated BAF caps stabilize our landed costs.”

Bunkers

Marine fuels used by ships, including HSFO, VLSFO, and MGO; procured via bunker suppliers and delivered by barge or truck.

-“We stemmed 1,200 MT of VLSFO at Singapore.” -“Switching to MGO inside the ECA is mandatory.” -“Bunker prices spiked after refinery outages.”

Cabotage

Domestic carriage of goods or passengers between ports within the same country, often restricted to national-flag vessels by law.

-“Cabotage rules bar foreign carriers from the coastal trade.” -“We need a waiver for this cabotage voyage.” -“Cabotage protection affects coastal freight rates.”

Capesize

A class of large bulk carriers (typically 150,000+ DWT) that traditionally transit via the Cape of Good Hope when fully laden due to canal constraints; used mainly for iron ore and coal.

-“Capesize rates surged on Brazil–China ore demand.” -“Draft limits make this a Capesize-restricted port.” -“We’re triangulating Capes to reduce ballast legs.”

Charter Party (C/P)

The contract between a shipowner and charterer specifying terms for the use of a vessel, including freight/hire, laytime, demurrage, and responsibilities.

-“We’re fixing under the NYPE 2015 C/P.” -“The Gencon C/P governs this voyage freight and laytime.” -“Check the C/P off-hire clause language.”

Classification Society

An organization (e.g., DNV, ABS, LR) that sets and verifies technical standards for ship design, construction, and maintenance, granting and maintaining class certificates.

-“The ship lost class after failing the special survey.” -“Class approved the scrubber retrofit drawings.” -“We’re transferring class from LR to DNV.”

Container Yard (CY)

The terminal area where containers are received, stored, and delivered. In pricing, CY-to-CY indicates carrier responsibility between origin and destination yards.

-“CY cutoff is 48 hours before vessel ETA.” -“Shipments move CY/CY under the service contract.” -“The CY is congested, so expect longer gate times.”

Contract of Affreightment (CoA)

An agreement to transport a specified quantity of cargo over a period using one or more vessels, without naming a specific ship in advance.

-“The steel mill secured a 2-year CoA for ore.” -“CoA flexibility helps us balance load programs.” -“Rates under the CoA are indexed to Baltic benchmarks.”

Deadweight Tonnage (DWT)

The maximum weight a ship can safely carry, including cargo, fuel, water, stores, and crew, measured in metric tons at the summer load line.

-“The ship’s DWT is 82,000 at summer draft.” -“Cargo intake depends on DWT and draft limits.” -“We lost intake due to higher bunkers in DWT.”

Demurrage

A liquidated damages charge payable when laytime is exceeded in a voyage charter, or when containers aren’t cleared from terminals within free time in liner trades.

-“We’re on demurrage after missing the laydays.” -“Container demurrage starts after day five.” -“Negotiate demurrage at ‘half demurrage, half despatch.’”

Despatch (Dispatch)

An incentive payment from the shipowner to the charterer for completing loading or discharge in less than the allowed laytime, often at half the demurrage rate.

-“We earned despatch by finishing 18 hours early.” -“The C/P sets despatch at 50% of demurrage.” -“Productivity gains can convert to despatch savings.”

Draft / Draught

The vertical distance between the waterline and the lowest point of the hull (keel); determines port access, canal transit, and cargo intake.

-“Max permitted draft is 12.5 meters at HW.” -“Freshwater allowance reduces our draft margin.” -“Squat effects require extra draft clearance.”

Draft Survey

A method to estimate cargo weight loaded or discharged by comparing a ship’s displacement from pre- and post-loading draft readings, corrected for density and trim.

-“We’ll do a draft survey to confirm coal tonnage.” -“Discrepancies were resolved after a second survey.” -“The charterer requires a joint draft survey.”

ECA (Emission Control Area)

Designated sea areas with stricter limits on sulfur and nitrogen oxides, requiring cleaner fuels or abatement technology (e.g., 0.10% sulfur in many ECAs).

-“Switch to MGO before entering the North Sea ECA.” -“Our scrubber enables ECA compliance on HSFO.” -“Voyage planning accounts for ECA fuel differentials.”

EEXI (Energy Efficiency Existing Ship Index)

An IMO efficiency standard for existing ships, effective 2023, assessing design-related CO2 emissions intensity; compliance may require Engine Power Limitation (EPL) or retrofits.

-“We fitted an EPL to meet EEXI on our Panamax.” -“The yard proposed a new propeller for EEXI gains.” -“Class issued our EEXI technical file approval.”

ETA / ETD (Estimated Time of Arrival/Departure)

Forecast times used for voyage planning, berth windows, and supply chain coordination; often updated with AIS and port call data.

-“Reconfirm ETA pilot station at 0600 LT.” -“ETD depends on completing bunkering by noon.” -“The customer tracks ETA/ETD in the portal.”

Feeder Service

Short-sea or regional container services that connect smaller ports with major hub ports, where cargo is transshipped to mainline vessels.

-“Cargo moves via a feeder to the Singapore hub.” -“Feeder capacity is tight after blank sailings.” -“We booked a 1,700 TEU feeder for the Bay of Bengal.”

Flag of Convenience (FoC)

Registering a ship in an open registry (e.g., Panama, Liberia) to benefit from lower costs or regulatory regimes, regardless of owner nationality.

-“The fleet is flagged under an FoC for flexibility.” -“FoC choices affect crewing and tax treatment.” -“The charterer prefers OECD-flagged tonnage, not FoC.”

Free In/Out (FIO/FIOS)

Rate terms allocating stevedoring costs: under FIO the charterer pays for loading/unloading; FIOS extends to stowage and trimming.

-“The C/P is FIOS, so cargo handling is on charterer’s account.” -“Switching from liner terms to FIO cut our base freight.” -“Confirm whether lashing is included or FIOS.”

General Average

A maritime principle where all stakeholders in a voyage proportionally share losses/costs from a voluntary sacrifice made to save the venture (often per York-Antwerp Rules).

-“The owner declared General Average after the fire.” -“Consignees must post GA bonds and guarantees.” -“The adjuster is finalizing GA contributions.”

Hub-and-Spoke Network

A routing model concentrating capacity on trunk (hub) services and distributing via feeder (spoke) services to increase frequency and utilization.

-“The carrier shifted to a hub-and-spoke model in the Med.” -“Hub rationalization improved load factors.” -“Feeder delays can ripple through the spokes.”

Incoterms

International commercial terms published by the ICC that define seller/buyer responsibilities for delivery, risk transfer, and costs (e.g., FOB, CIF, DDP).

-“Under FOB Shanghai, risk passes when onboard.” -“CIF includes marine insurance arranged by the seller.” -“We quote DAP to simplify the buyer’s import.”

International Maritime Organization (IMO)

The UN specialized agency that sets global standards for ship safety, security, and environmental performance via conventions such as SOLAS, MARPOL, and STCW.

-“IMO 2020 introduced the 0.50% sulfur cap.” -“Upcoming IMO CII rules affect chartering strategy.” -“IMO instruments guide PSC inspections.”

ISM Code (International Safety Management)

An international standard requiring shipowners and managers to implement a Safety Management System (SMS), certified by a DOC (company) and SMC (ship).

-“The DOC audit is scheduled next month.” -“The SMC expires unless we complete the intermediate audit.” -“Non-conformities under ISM must be closed promptly.”

ISPS Code (International Ship and Port Facility Security)

A security framework under SOLAS requiring threat assessment, security plans, and designated officers for ships and port facilities.

-“Security Level 2 was set by the authority.” -“The PFSO requested the ship’s ISSC.” -“We conducted an ISPS drill before arrival.”

Just-in-Time Arrival (JIT)

An operational practice to optimize speed and arrival time so the ship reaches berth just as it becomes available, reducing fuel burn and anchorage time.

-“JIT cut waiting by 18 hours and saved 12 MT of fuel.” -“Port call optimization enables JIT arrivals.” -“The terminal shared target arrival windows for JIT.”

Keel Clearance / Under Keel Clearance (UKC)

The minimum safe distance between the keel and seabed, managed dynamically for tides, squat, and swell to prevent grounding.

-“Company policy requires 10% UKC under keel.” -“Pilotage orders specified a 1.0 m static UKC.” -“We delayed to build tide for UKC compliance.”

Laycan (Laydays and Cancelling)

The agreed window during which the vessel must present for loading; if the ship misses the cancelling date, the charterer may cancel the fixture.

-“Laycan 10–12 Oct, canceling 2359 LT.” -“We’ll arrive within laycan to avoid failure to tender.” -“Broker asked to extend laycan by 24 hours.”

Load Line / Plimsoll Mark

Markings on the ship’s hull indicating the maximum legal draft for various seasons and zones; linked to the Load Line Certificate.

-“We cannot submerge the summer load line.” -“Winter marks reduce permissible draft.” -“Surveyor checked freeboard against the Plimsoll mark.”

MARPOL (International Convention for the Prevention of Pollution from Ships)

IMO convention with Annexes I–VI covering oil, noxious liquids, harmful substances, sewage, garbage, and air emissions; basis for the global sulfur cap.

-“Garbage handling follows MARPOL Annex V.” -“Annex VI governs NOx tiers and SOx limits.” -“PSC verified our MARPOL record books.”

Notice of Readiness (NOR)

A formal notice tendered by the master/agent that the vessel has arrived and is ready to load/discharge, which triggers laytime per the C/P terms.

-“NOR was tendered WIBON at anchorage.” -“Laytime starts six hours after valid NOR.” -“NOR acceptance is pending free pratique.”

NVOCC (Non-Vessel-Operating Common Carrier)

A carrier that issues its own house B/L and assumes carrier liability but does not operate vessels; consolidates cargo and books with vessel operators.

-“The NVOCC issued HBLs and took space on a mainline carrier.” -“FMC registration is required for US trades.” -“We route SME shipments via an NVOCC for flexibility.”

Off-hire

A period during a time charter when the vessel is unavailable for service due to events like breakdowns or dry-docking, suspending hire per the C/P clause.

-“Main engine failure put the ship off-hire for 18 hours.” -“The off-hire clause excludes weather delays.” -“Owner disputes the off-hire calculation.”

Panamax / New Panamax

Ship size classes defined by Panama Canal limits: Panamax (old locks; approx. 32.3 m beam), and New Panamax/Neopanamax (new locks; approx. 49 m beam), affecting container, bulk, and tanker designs.

-“A 9,500 TEU Neopanamax transits via the new locks.” -“Beam exceeds Panamax limits, so we route via Suez.” -“Draft restrictions cap our intake to Panamax specs.”

P&I Club (Protection and Indemnity)

Mutual insurers covering shipowners’ and charterers’ third-party liabilities (e.g., pollution, cargo, crew), often members of the International Group of P&I Clubs.

-“The P&I Club issued the LOI wording.” -“Pollution liabilities are covered under P&I.” -“We switched P&I to reduce deductibles.”

Pilotage

Compulsory use of a local maritime pilot to assist a ship’s navigation in confined or regulated waters; billed as pilotage dues.

-“Pilot boarding time is 0300 at the pilot station.” -“Draft and tide dictate pilotage windows.” -“Pilotage exemption applies to ferries on this route.”

Port State Control (PSC)

Inspections by coastal states to verify foreign ships’ compliance with international conventions; detentions can result from serious deficiencies.

-“PSC detained the vessel for ISM non-conformities.” -“Paris MoU risk profile affects inspection frequency.” -“We prepared for PSC targeting at this port.”

Ro-Ro (Roll-on/Roll-off)

Vessels designed to carry wheeled cargo via ramps (e.g., cars, trucks, trailers); capacity often measured in lane meters or CEU.

-“PCTC Ro-Ro demand rose on US auto imports.” -“Weather forced closure of the aft Ro-Ro ramp.” -“We plan to stow heavy trailers on deck 3.”

Scrubber (Exhaust Gas Cleaning System)

An onboard system that removes SOx from exhaust to comply with sulfur limits; types include open-loop, closed-loop, and hybrid.

-“Open-loop scrubbers face wash-water restrictions in some ports.” -“The ROI on scrubbers depends on HSFO-VLSFO spreads.” -“Class approved the scrubber installation.”

Slow Steaming

Operating at reduced speeds to cut fuel consumption and emissions, often used to match capacity with demand in liner trades.

-“Slow steaming saved 25% fuel on the Asia–Europe loop.” -“Schedules were adjusted for super-slow steaming.” -“Charterers requested speed clauses amid slow steaming.”

SOLAS (Safety of Life at Sea)

The principal IMO convention for ship safety, covering construction, equipment, operations, GMDSS, ISM (Chap. IX), and ISPS (Chap. XI-2).

-“VGM requirements stem from SOLAS amendments.” -“PSC cited a SOLAS lifesaving appliance deficiency.” -“Compliance with SOLAS fire safety drills is monitored.”

Stevedore

Dock labor or companies engaged in loading/unloading ships; their charges and productivity directly affect port time and costs.

-“Stevedore gangs will start at first light.” -“Stevedoring rates increased under the new CBA.” -“Damages to cargo were reported by the stevedore.”

TEU / FEU

Standardized container capacity units: Twenty-foot Equivalent Unit (TEU) and Forty-foot Equivalent Unit (FEU), used to measure ship and terminal throughput.

-“A 24,000 TEU ULCS calls weekly.” -“Contract rates are per FEU to the USWC.” -“Terminal handled 1.8 million TEU YTD.”

Time Charter

A contract to hire a vessel for a set period at a daily rate, where the charterer directs employment and usually pays bunkers, while the owner operates and maintains the ship.

-“We fixed a one-year time charter at $27,500/day.” -“Off-hire events are detailed in Clause 15.” -“Redelivery window is Singapore–Japan range.”

Voyage Charter

A contract for carriage on a specific voyage at an agreed freight rate, with the owner paying voyage costs and the charterer paying demurrage if laytime is exceeded.

-“Freight is $20/MT under a Gencon voyage charter.” -“Laytime runs SHINC as per the recap.” -“We accrued demurrage due to weather delays.”