Maritime Risk Lexicon
101 terms of shipping and marine insurance, defined in plain, precise English. Every entry links to its neighbours; every definition is original.
A
- Actual Total Loss
Insurance
The complete destruction of the insured property, or damage so thorough it ceases to be a thing of the kind insured: a ship burned out, sunk beyond recovery, or seized without prospect of return. Unlike a constructive total loss, no notice of abandonment is needed; the loss speaks for itself.
See also Constructive Total Loss (CTL) · War Risk
- Aframax
Navigation
The mid-size crude tanker, roughly 80-120,000 dwt, named for the old AFRA rate schedule. Flexible enough for most ports and short-haul trades, the class became the backbone of shadow-fleet oil movements, where its size suits ship-to-ship transfers and secondary buyers.
See also VLCC · Suezmax · Dark Fleet
- AIS
Navigation
The Automatic Identification System: a VHF transponder broadcasting a ship's identity, position, course and speed to nearby vessels and, via satellites and coastal receivers, to the world. Mandated for collision avoidance, it became the raw material of maritime transparency, and manipulating it became the signature of vessels with something to hide.
See also AIS Spoofing · MMSI · Dark Fleet
- AIS Spoofing
Security
Broadcasting false AIS data so a ship appears somewhere she is not, or as someone she is not: fabricated positions drawn along plausible tracks, borrowed identities of innocent vessels, impossible geometry only analysis reveals. Distinct from simply going dark, spoofing is active deception, and detecting it is a core discipline of maritime intelligence.
See also AIS · Dark Fleet · GPS Jamming
- Anchorage
Navigation
Designated water where ships wait, for berths, orders, tide or storms, holding on their anchors. Anchorages are the waiting rooms of world trade: counting ships at anchor measures congestion, and watching which anchorages fill with elderly tankers measures something else entirely.
See also NOR (Notice of Readiness) · STS (Ship-to-Ship) Transfer · Draught (Draft)
- Average Adjuster
Insurance
The independent professional who computes how the losses of a maritime casualty are shared: what counts as general average, what each cargo and hull interest must contribute, and what insurers owe. Adjustments on a large casualty can run to years and hundreds of pages, applying the York-Antwerp Rules line by line.
See also General Average · York-Antwerp Rules
B
- Ballast Voyage
Navigation
A leg sailed without cargo, seawater ballast providing stability, to reposition the ship for her next employment. Ballast miles earn nothing and burn fuel, so the ballast-to-laden ratio is a core economic metric; wars and canal closures that stretch ballast legs quietly tax the whole fleet.
See also Draught (Draft) · Spot Market
- Baltic Exchange
Chartering
The London institution whose panels of brokers assess daily freight rates for standard routes, published as the Baltic indices. No cargo passes through it; what it produces is the market's agreed memory and benchmark, underpinning freight derivatives and the settlement of countless charter disputes.
See also BDI (Baltic Dry Index) · FFA (Forward Freight Agreement) · Worldscale
- Bareboat Charter
Chartering
The lease of the ship herself: the charterer takes possession, appoints the crew, insures and operates as if owner for the term, paying hire for the hull alone. Also called charter by demise, it is as much a financing structure as an operating one, common in sale-and-leaseback and flagging arrangements.
See also Demise Clause · Time Charter · Flag of Convenience
- BDI (Baltic Dry Index)
Chartering
The Baltic Exchange's composite of timecharter rates for capesize, panamax and supramax bulk carriers, weighted and published daily. Long read as a barometer of world trade, it is more precisely a barometer of the balance between dry cargo demand and the fleet available to carry it, which is why it swings so violently.
See also Baltic Exchange · Capesize · Panamax
- Bill of Lading
Legal
The central document of ocean trade, performing three roles at once: receipt for the goods shipped, evidence of the contract of carriage, and document of title whose transfer passes the right to claim the cargo. Banks lend against it, buyers pay against it, and carriers must deliver only against its surrender.
See also Letter of Indemnity · Charter Party
- Blocking & Trapping
Insurance
War-risk cover for a ship prevented from leaving a port or waterway by hostilities, blockade or closure, rather than physically damaged. After an agreed period of detention, typically six or twelve months, the vessel may be treated as a total loss. Ships trapped in conflict ports made this once-obscure clause central again.
See also War Risk · Constructive Total Loss (CTL)
- BMP5
Security
The fifth edition of Best Management Practices, the industry's consolidated guidance for deterring piracy and armed robbery: hardening the ship, razor wire and water cannon, lookouts and evasive manoeuvring, reporting to naval centres, citadel procedures. Compliance is voluntary but underwriters, charterers and navies all ask the same question after an attack: was BMP followed?
See also Citadel · High Risk Area (HRA) · UKMTO
- Breakbulk
Navigation
General cargo carried piece by piece, bagged, crated, palletised or unpackaged, stowed individually rather than poured in bulk or locked in containers. The dominant mode before containerisation, it survives where cargo will not fit a box: steel coils, machinery, timber, and the project cargoes that keep heavy-lift ships employed.
See also Project Cargo · Heavy Lift · MPP (Multi-Purpose Vessel)
- Bunker
Navigation
Ship's fuel, named for the coal bunkers of the steam era. Bunkers are the largest single voyage cost, so their price, and who bears it, owner on voyage charter, charterer on time charter, shapes commercial behaviour from speed to routing. Bunkering, the act of refuelling, is itself a specialised and dispute-prone trade.
See also IFO / VLSFO · Slow Steaming
C
- Capesize
Navigation
The largest class of dry bulk carrier, around 180,000 dwt, historically too big for the Suez and Panama canals and so obliged to round the capes that give the class its name. Employed overwhelmingly in iron ore and coal on the long hauls from Brazil and Australia to Asia.
See also Panamax · BDI (Baltic Dry Index) · Deadweight (DWT)
- Charter Party
Chartering
The contract by which a shipowner lets a vessel to a charterer, on standard forms amended clause by clause in negotiation. Its species differ in what is transferred: a voyage charter sells carriage, a time charter sells the ship's service, a bareboat charter hands over the ship herself.
See also Voyage Charter · Time Charter · Bareboat Charter · Fixture
- Chokepoint
Navigation
A narrow passage that concentrates a disproportionate share of world trade: Hormuz for oil, Malacca for Asia's imports, Suez and Bab el-Mandeb for the Europe-Asia artery, Panama, Gibraltar, the Bosphorus, Dover, the Danish straits. Chokepoints turn local incidents into global freight events, which is why this observatory watches them first.
See also Suezmax · Rerouting Index · Frustration of Voyage
- Citadel
Security
A fortified refuge inside the ship, typically the steering-gear space or a hardened compartment, where the crew locks itself during a boarding, with communications, water and engine controls if well designed. The tactic denies attackers hostages; naval forces will generally only assault a hijacked ship when the whole crew is confirmed in the citadel.
See also BMP5 · PCASP (Armed Guards) · Kidnap & Ransom (K&R)
- Classification Society
Navigation
A private technical body that sets structural and machinery rules, surveys ships against them, and certifies the result, the 'class' on which insurers, flags and financiers rely. Leading societies form the IACS association; loss of class is a commercial event as serious as any casualty, and shadow fleets drift toward lenient registers.
See also Surveyor · Seaworthiness · Flag of Convenience
- COA (Contract of Affreightment)
Chartering
An agreement to carry a series of cargoes, a quantity over a period, rather than to employ a named ship. The owner chooses which vessels perform each lifting within agreed windows. COAs give shippers capacity certainty and owners baseload employment, smoothing both sides against the spot market's noise.
See also Voyage Charter · Spot Market
- Constructive Total Loss (CTL)
Insurance
The point at which a damaged ship is treated as lost because saving or repairing her would cost more than her insured value. The assured tenders notice of abandonment and claims the full sum insured; the underwriter takes over the wreck and its liabilities. Casualties in war zones often become CTLs when repair is possible but access is not.
See also Actual Total Loss · Hull & Machinery (H&M) · Wreck Removal
D
- Dark Fleet
Security
The parallel tanker fleet assembled to move sanctioned oil: ageing ships under obscure ownership, rotating flags, marginal insurance and a habit of disabling or falsifying AIS. Estimated in the several hundreds of hulls, it trades outside the safety architecture the mainstream market spent decades building, and casualties are increasingly where it shows.
See also AIS Spoofing · Sanctions Designation · Oil Price Cap · STS (Ship-to-Ship) Transfer
- Dead Freight
Chartering
Freight payable on cargo the charterer promised but failed to ship: the empty space still earns, because the owner priced the voyage on the full quantity. Claimed as damages at the freight rate less any expenses saved, it protects owners from charterers who book a ship and fill half of her.
See also Voyage Charter · Deadweight (DWT)
- Deadweight (DWT)
Navigation
The total weight a ship can carry, cargo, fuel, water, stores and crew, at her maximum permitted draught. The standard measure of bulk and tanker capacity: a 300,000 dwt VLCC can lift roughly two million barrels. Not to be confused with gross tonnage, which measures enclosed volume, not carrying ability.
See also Draught (Draft) · VLCC · Dead Freight
- Deductible
Insurance
The first slice of every loss that the assured bears before insurance responds, set as an amount per claim or, in loss-of-hire, days per casualty. Deductibles filter attritional claims out of the market and keep the owner financially interested in prevention. Larger fleets often carry substantial deductibles and self-insure the working layer.
See also Loss of Hire · Hull & Machinery (H&M)
- Demise Clause
Legal
A bill-of-lading clause providing that the contract of carriage is with the ship's registered owner, not the charterer who issued the bill. Its purpose is to steer cargo claims toward the party with the vessel and its insurance behind it; its effect, in many disputes, is a preliminary battle over who the carrier actually is.
See also Bill of Lading · Bareboat Charter
- Demurrage
Chartering
Liquidated damages the charterer pays, at an agreed daily rate, for detaining the ship beyond the laytime allowed for cargo operations. It compensates the owner for lost earning time without proof of actual loss. The maxim 'once on demurrage, always on demurrage' means laytime exceptions generally stop protecting the charterer once the clock has run out.
- Despatch
Chartering
The mirror image of demurrage: a reward, customarily at half the demurrage rate, that the owner pays the charterer for completing cargo operations before laytime expires. Common in dry-bulk trades and rare in tankers, it prices the value of getting the ship back to sea early.
- Detention
Chartering
Compensation for holding the ship or equipment beyond the contractual framework that demurrage governs, for instance delay before laytime can start, after cargo operations end, or container equipment kept past free days. Unlike demurrage's agreed daily rate, detention often must be proved as actual damages, unless the contract fixes a rate.
- Deviation
Legal
An unjustified departure from the contractual or customary route. Classical carriage law punished it severely, stripping the carrier of every defence and exclusion, because cargo and its insurers had priced the agreed route. Deviation to save life or property at sea is always permitted; deviation to save money is not.
See also Seaworthiness · Frustration of Voyage · Rerouting Index
- Draught (Draft)
Navigation
The vertical distance from waterline to keel: how deep the ship sits. Draught governs everything spatial, which ports she can enter, which channels she can pass, how much cargo she may load before reaching her marks. Canal and chokepoint restrictions are expressed first of all as maximum draught.
See also Deadweight (DWT) · Chokepoint · Anchorage
F
- Feeder
Chartering
A small container vessel distributing boxes between a hub port and ports the mainline ships skip, whether too small, too shallow or too far off the trunk routes. Feeder networks are the capillaries of container trade; when a chokepoint diversion reshuffles hub calls, feeders absorb the disruption first.
See also Transshipment · TEU · Chokepoint
- FFA (Forward Freight Agreement)
Chartering
A cash-settled derivative on future freight rates, settled against Baltic index averages for a route and month. FFAs let owners lock in earnings and charterers cap costs without touching a physical ship, and give speculators a way to trade the freight cycle. Cleared through clearing houses since counterparty collapses taught the market caution.
See also Baltic Exchange · BDI (Baltic Dry Index) · Spot Market
- Fixture
Chartering
A concluded chartering deal: the moment owner and charterer, through their brokers, agree main terms and the ship is 'fixed'. Fixtures are the market's data points; reported fixtures move indices and inform the next negotiation. A fixture 'on subjects' remains conditional until the stated subjects are lifted.
See also Spot Market · Charter Party · Laycan
- Flag of Convenience
Legal
Registration of a ship in a state with which she has no genuine economic link, chosen for cost, tax or lighter oversight. Open registries range from well-run to nominal. The flag determines applicable law, labour standards and inspection regimes, which is why flag-hopping is a recurring feature of sanctions evasion.
See also Dark Fleet · Classification Society · PSC (Port State Control)
- Flat Rack
Navigation
A container reduced to floor and end walls, used for cargo too wide, tall or awkward for a closed box: machinery, boats, steel structures. Flat racks travel in the container system while behaving like breakbulk, requiring lashing calculations and often out-of-gauge surcharges and stowage on deck or atop the stack.
See also OOG (Out of Gauge) · TEU · Breakbulk
- Frustration of Voyage
Legal
The doctrine that discharges a contract when supervening events, such as war, canal closure or a trapped ship, make performance radically different from what was agreed rather than merely more expensive. Courts apply it sparingly: a longer route around a cape is usually inconvenience, not frustration; an indefinitely blocked port may qualify.
See also Blocking & Trapping · Deviation · Chokepoint
G
- General Average
Legal
The ancient rule that when part of a maritime venture is deliberately sacrificed to save the whole, such as cargo jettisoned or salvors engaged, all interests contribute in proportion to the values saved. Declared by the shipowner after a casualty, it obliges every cargo owner to post security before delivery.
See also York-Antwerp Rules · Average Adjuster · Salvage
- GPS Jamming
Security
Drowning satellite navigation signals in radio noise so receivers lose their fix, a byproduct of electronic warfare that spills over shipping lanes near conflict zones. Jammed ships fall back on radar and inertial reckoning; their AIS may broadcast wildly wrong positions, producing the circular clusters and onshore tracks this observatory counts by zone.
See also AIS Spoofing · AIS · High Risk Area (HRA)
H
- Handysize
Navigation
The smaller bulk carriers, roughly 10-40,000 dwt, usually geared with their own cranes and able to enter ports the larger classes cannot. They carry the awkward and regional trades, grains, fertilisers, steel, logs, and their earnings track local trade health more than global commodity booms.
See also Panamax · MPP (Multi-Purpose Vessel) · Deadweight (DWT)
- Heavy Lift
Navigation
Cargo beyond the reach of ordinary ship's gear, and the specialised fleet built to carry it: vessels with cranes of several hundred tonnes' capacity, or semi-submersibles that ballast down so a floating cargo can be positioned above the deck. The niche where naval architecture, rigging and insurance underwriting meet most intimately.
See also Project Cargo · Breakbulk
- High Risk Area (HRA)
Security
An industry-declared zone where piracy or armed attack warrants heightened defensive measures and reporting, historically centred on the western Indian Ocean. Distinct from underwriters' listed areas, though they often overlap: the HRA drives operational posture under BMP, while listed areas drive insurance notice and premium.
See also BMP5 · Listed Areas · UKMTO
- Hull & Machinery (H&M)
Insurance
The property insurance of the ship itself: hull, engines, equipment. It responds to physical damage from marine perils such as collision, grounding, fire and heavy weather. It does not cover war perils or most third-party liabilities, which sit with war-risk underwriters and P&I clubs respectively. The lead H&M underwriter often sets claims handling for the market that follows.
See also War Risk · Constructive Total Loss (CTL) · Underwriter
I
- IFO / VLSFO
Navigation
Grades of residual marine fuel. IFO, intermediate fuel oil, dominated until the IMO's 2020 sulphur cap; VLSFO, very low sulphur fuel oil at 0.5 percent, replaced it as the default. Ships with exhaust scrubbers may still burn cheaper high-sulphur fuel, and the price spread between grades finances the scrubber.
See also Bunker · Slow Steaming
- IMO Number
Navigation
A seven-digit identifier assigned to a hull for life, surviving every change of name, flag and owner, and required to be permanently marked on the ship. It is the anchor of vessel identity in registries, casualty records and sanctions lists, which is why identity laundering focuses on everything except this number.
See also MMSI · Flag of Convenience · Classification Society
- Institute Clauses
Insurance
The standard sets of policy wordings, historically drafted by the Institute of London Underwriters, that structure most marine insurance: Institute Cargo Clauses A, B and C, Institute War Clauses, Institute Time Clauses Hulls. Their lettered grades and numbered exclusions form the shared grammar in which marine risk is bought and litigated.
See also War Risk · Hull & Machinery (H&M)
- ISM Code
Navigation
The International Safety Management Code, which requires every operator to run a documented safety management system linking ship and shore, with a designated person ashore answerable for it. It turned safety from a matter of individual seamanship into auditable corporate process, and its paper trail now frames casualty litigation.
See also ISPS Code · Seaworthiness · PSC (Port State Control)
- ISPS Code
Security
The International Ship and Port Facility Security Code, adopted after 2001, which requires ships and ports to maintain security plans, officers and drills, and to operate at graduated security levels set by governments. It is the legal skeleton of maritime security; its declarations and records also generate the paperwork trail analysts mine.
J
- JWC (Joint War Committee)
Insurance
A committee of Lloyd's and company-market underwriters that publishes the Hull War, Piracy, Terrorism and Related Perils listed areas. Its circulars do not ban trade; they redraw the map of where war-risk cover needs notice and extra premium. Markets, charterers and navies all read JWC changes as an authoritative risk signal.
See also Listed Areas · War Risk · Breach Premium
K
- Kidnap & Ransom (K&R)
Insurance
Specialist cover, bought discreetly, that reimburses ransom payments, response consultants and related costs when crew are taken hostage. Policies are deliberately confidential since knowledge of cover can itself raise the ransom. In piracy eras it became a standard, if unspoken, layer of the transit-risk stack alongside war risk.
See also High Risk Area (HRA) · Citadel · War Risk
L
- Laycan
Chartering
The contractual window, from layday to cancelling date, within which the ship must arrive and tender notice of readiness. Arrive before it and the charterer need not start loading; arrive after it and the charterer may cancel the fixture outright. Missing a laycan in a falling market is every owner's quiet fear.
See also NOR (Notice of Readiness) · Fixture · Charter Party
- Laytime
Chartering
The period the voyage charterer is allowed, free of extra charge, to load and discharge the ship. Counted in days or hours once notice of readiness is valid, and interrupted or not by weather, weekends and strikes exactly as the charter's exceptions provide. When laytime expires, demurrage begins.
See also Demurrage · NOR (Notice of Readiness) · Despatch
- Letter of Indemnity
Legal
A promise to hold the carrier harmless for doing something the bill of lading does not permit, most commonly delivering cargo without the original bill or changing destination. Commercially routine and legally fragile: courts refuse to enforce LOIs that cover what amounts to fraud, leaving the issuer exposed.
See also Bill of Lading · Deviation
- Listed Areas
Insurance
The geographic zones that war-risk underwriters designate as requiring notice and additional premium before entry. The reference list is maintained by the Joint War Committee in London and revised by circular as threats evolve. A vessel's presence inside a listed area without notification can void cover entirely.
See also JWC (Joint War Committee) · Breach Premium · War Risk
- LOF (Lloyd's Open Form)
Legal
The world's standard salvage contract, signed in minutes without negotiating price: 'open' because the reward is left blank, to be arbitrated later in London against the values saved. A master facing a fire can commit to LOF by radio, and the salvor starts work knowing the arbitration system will pay fairly.
See also Salvage · No Cure, No Pay · SCOPIC
- Loss of Hire
Insurance
Insurance that replaces a vessel's daily earnings while she is off-hire after insured physical damage, typically above a deductible of a fixed number of days and up to an agreed limit. Without it, a shipowner carries the income gap between casualty and repair alone, even when hull insurers pay for the steel.
See also Off-Hire · Hull & Machinery (H&M) · Deductible
M
- MGA (Managing General Agent)
Insurance
An intermediary given delegated authority by insurers to quote, bind and sometimes settle claims on their behalf. In marine war risk, specialist MGAs write niche books such as breach premiums for specific regions, moving faster than the underlying carriers whose capital they deploy and whose appetite frames their limits.
See also Underwriter · Breach Premium
- MICA Center
Security
The French Navy's Maritime Information Cooperation and Awareness Center in Brest, which monitors worldwide shipping security and coordinates voluntary reporting schemes, notably in the Gulf of Guinea. Its analyses and annual reports are among the few authoritative, freely published syntheses of global maritime security incidents.
See also UKMTO · High Risk Area (HRA)
- MMSI
Navigation
The Maritime Mobile Service Identity, a nine-digit radio identity programmed into AIS and DSC equipment, issued by the flag state and changed on reflagging. Because it is mutable where the IMO number is not, tracking analysts treat MMSI switches, especially frequent ones, as a first-order anomaly signal.
See also AIS · IMO Number · AIS Spoofing
- MPP (Multi-Purpose Vessel)
Navigation
A tween-decked, usually geared ship designed to carry almost anything: containers on deck, breakbulk below, project pieces under its own heavy cranes. MPPs live in the gaps between the specialised fleets, and their spot availability is a quiet indicator of how much awkward cargo the world is moving.
See also Breakbulk · Project Cargo · Handysize
- MSCHOA
Security
The Maritime Security Centre, Horn of Africa, run by EU naval forces: the registration and coordination hub for merchant ships transiting the western Indian Ocean, administering group transit schemes and liaising between shipping and military planners. Registering with MSCHOA is a standard line in BMP-compliant voyage preparation.
See also UKMTO · BMP5 · Naval Escort
N
- No Cure, No Pay
Legal
The principle at the heart of traditional salvage: the salvor earns nothing unless property is actually saved. It concentrates effort wonderfully and finances failure badly, which is why modern practice added the SCOPIC clause so that salvors protecting the environment are paid even when the ship itself is lost.
See also Salvage · SCOPIC · LOF (Lloyd's Open Form)
- NOR (Notice of Readiness)
Chartering
The master's formal declaration that the ship has arrived at the agreed place and is in all respects ready to load or discharge. A valid NOR is the trigger that starts laytime; an invalid one, tendered too early, in the wrong place or from an unready ship, can cost the owner days of counting.
- Notice of Cancellation
Insurance
The war-risk market's escape hatch: underwriters may cancel or re-rate cover on short notice, conventionally seven days, in response to a deteriorating situation. The clause lets insurers stay on risk in peacetime pricing while retaining the right to reprice the moment war perils sharpen. Reinstatement then arrives with new premium and new geography.
See also War Risk · Listed Areas
O
- Off-Hire
Chartering
Periods during a time charter when hire ceases because the ship cannot render the service required: breakdowns, dry-docking, crew deficiencies, sometimes detentions. The clause is a no-fault allocation of time risk; the charterer stops paying whether or not the owner is to blame, but only for causes the clause actually lists.
See also Time Charter · Loss of Hire
- Oil Price Cap
Legal
The G7-led mechanism that permits Western shipping, insurance and financial services for seaborne Russian oil only when sold at or below a set price. Enforced through attestations along the service chain, it made insurers into sanctions gatekeepers and pushed cap-averse trade onto older, opaquely insured tonnage.
See also Dark Fleet · Sanctions Designation · STS (Ship-to-Ship) Transfer
- OOG (Out of Gauge)
Navigation
Container-system cargo whose dimensions exceed the standard box envelope, protruding above an open top or beyond a flat rack's sides. OOG pieces break the neat geometry of stowage planning: they sterilise adjacent slots, demand special handling, and are priced accordingly, in surcharges and in lost slot capacity.
See also Flat Rack · Project Cargo
P
- P&I Club
Insurance
A mutual association of shipowners that insures the liabilities commercial underwriters historically declined: cargo damage, crew injury, pollution, wreck removal. Members pay 'calls' rather than premiums and effectively insure one another. Thirteen major clubs form the International Group, which pools the largest claims between them and buys collective reinsurance above the pool.
See also P&I Correspondent · Hull & Machinery (H&M) · Wreck Removal
- P&I Correspondent
Insurance
A local agent appointed by a P&I club in a port to act when a member's ship has a problem there: arranging surveyors, lawyers, hospital care, bail or guarantees. Correspondents are the club's eyes in places the club has no office, and often the first professional on the scene of a casualty.
- Panamax
Navigation
A vessel built to the largest dimensions the original Panama Canal locks could pass, around 32 metres beam, roughly 60-80,000 dwt in bulkers. The 2016 expansion created the wider neopanamax class, but the old constraint still names a segment and prices a market of its own.
See also Capesize · Suezmax · Deadweight (DWT)
- PCASP (Armed Guards)
Security
Privately Contracted Armed Security Personnel: licensed teams embarked for transits through piracy waters, operating under flag-state rules and graduated force procedures. Their spread after 2011 coincided with the collapse of successful Somali hijackings; no ship carrying a professional armed team has been taken, a statistic the market noticed immediately.
See also BMP5 · Citadel · High Risk Area (HRA)
- Pilotage
Navigation
The conduct of a ship through confined waters by a local expert who boards for the passage, compulsory in most ports and canals. The pilot advises while the master remains in command, a division of authority polished by centuries of dispute. Chokepoint transits, Suez, Panama, the Bosphorus, are pilotage operations at scale.
See also Chokepoint · Draught (Draft)
- Project Cargo
Navigation
The outsized, high-value components of industrial projects: turbines, reactors, transformer units, wind-farm blades. Each shipment is engineered individually, with lifting plans, cribbing calculations and route studies, because the pieces are irreplaceable and schedules unforgiving. A single stowage error can cost more than the freight of the whole voyage.
See also Heavy Lift · Breakbulk · OOG (Out of Gauge)
- PSC (Port State Control)
Navigation
The inspection of foreign ships by the states they visit, checking certificates, condition and crew competence against international conventions, with power to detain the substandard. Organised in regional memoranda that share targeting data, PSC is the safety net beneath flags that inspect too little, and its detention lists are public.
See also Flag of Convenience · ISM Code · Classification Society
R
- Reinsurance
Insurance
Insurance bought by insurers: the mechanism that spreads a single casualty across many balance sheets worldwide. Marine war books rely on it heavily since one port strike or one convoy loss can aggregate. The P&I clubs' collective programme is among the largest single reinsurance placements in existence.
See also Underwriter · P&I Club
- Rerouting Index
Navigation
Any measure comparing traffic on a threatened route with its long-way alternative, in this observatory's case weekly Cape of Good Hope roundings against Suez transits. Rerouting converts risk into distance: the index rises when the market judges extra days and bunkers cheaper than the strait's premium and peril.
See also Chokepoint · Slow Steaming · War Risk
- Ro-Ro
Navigation
Roll-on, roll-off: ships whose cargo drives aboard over ramps, cars, trucks, trailers and rolling project pieces, stowed on vehicle decks. Fast in port and vulnerable at sea: large open decks make fire and stability the classic ro-ro perils, and car carriers burn spectacularly when lithium batteries ignite.
S
- Salvage
Legal
The service of saving a ship, cargo or the marine environment from peril at sea, and the reward that the law grants for it. The reward is assessed after the fact against the values saved and the danger run, a deliberate incentive for professional salvors to keep expensive tugs and crews on standby.
See also LOF (Lloyd's Open Form) · No Cure, No Pay · Sue & Labour
- Sanctions Designation
Legal
The formal listing of a vessel, owner or operator by an authority such as OFAC, the EU or the UK, freezing assets and prohibiting dealings. For a designated ship the practical effect is civil death in the mainstream market: no flag, no class, no insurance, no port, leaving only the shadow ecosystem.
See also Dark Fleet · Oil Price Cap · Flag of Convenience
- SCOPIC
Legal
The Special Compensation P&I Club clause, an optional supplement to Lloyd's Open Form that guarantees the salvor tariff-based remuneration, funded by the shipowner's P&I club, when a no-cure-no-pay award would be inadequate, typically in environmental-threat cases. It replaced the unworkable 'special compensation' regime of the 1989 Salvage Convention.
See also LOF (Lloyd's Open Form) · No Cure, No Pay · P&I Club
- Seaworthiness
Legal
The vessel's fitness, in hull, equipment, crew and documentation, to meet the ordinary perils of the intended voyage and carry the agreed cargo. It is the foundational warranty of carriage law: an owner who fails to exercise due diligence to make the ship seaworthy loses defences, cover and, often, the case.
See also Classification Society · ISM Code · Deviation
- Slow Steaming
Chartering
Running ships deliberately below design speed to cut fuel burn, which rises roughly with the cube of speed. Adopted fleet-wide whenever bunkers are dear or markets oversupplied, it quietly absorbs surplus tonnage: a fleet that sails slower is effectively a smaller fleet, tightening supply without laying anything up.
See also Bunker · IFO / VLSFO · Rerouting Index
- Spot Market
Chartering
The market for single voyages fixed close to loading dates, as opposed to period employment. Spot rates respond within hours to disruptions, embargoes and canal closures, which makes them the most sensitive public gauge of maritime risk. Owners trading spot capture spikes and absorb slumps in full.
See also Fixture · Worldscale · BDI (Baltic Dry Index)
- STS (Ship-to-Ship) Transfer
Navigation
Transferring cargo, usually oil, between two vessels moored alongside at sea, with fenders, hoses and, in well-run operations, specialist supervision. Legitimate uses include lightering into shallow ports and building VLCC stems from smaller parcels. It is also the shadow trade's favourite tool for switching cargo identity offshore.
See also Transshipment · Dark Fleet · Aframax
- Sue & Labour
Insurance
A policy clause obliging and entitling the assured to take reasonable steps to prevent or minimise an insured loss, with those expenses recoverable in addition to the claim itself. It aligns incentives: the owner who hires tugs to save a drifting ship is spending the underwriter's money to save the underwriter more.
See also Salvage · Hull & Machinery (H&M)
- Suezmax
Navigation
The largest tanker able to transit the Suez Canal fully laden, in practice around 160,000 dwt carrying a million barrels. The class embodies a routing bet: sized for the canal shortcut, it is also the first tonnage to feel the economics shift when Suez becomes expensive, risky or closed.
See also VLCC · Aframax · Chokepoint
- Surveyor
Insurance
The independent expert who inspects and reports: on a ship's condition for insurers, on cargo damage for claimants, on drafts for quantity, on holds for cleanliness. Casualties are reconstructed largely from surveyors' contemporaneous findings, which is why each interested party tends to appoint its own.
See also Average Adjuster · Classification Society · P&I Correspondent
T
- TEU
Navigation
Twenty-foot equivalent unit, the container trade's unit of account: one standard twenty-foot box. A forty-foot container counts as two. Ship capacity, port throughput and freight indices are all quoted in TEU, letting a mixed stack of steel boxes be summed into a single comparable number.
- Time Charter
Chartering
Employment of a ship for a period at a daily hire rate. The owner mans, maintains and navigates; the charterer directs her commercially, chooses cargoes and ports, and pays for fuel. The dividing line generates the classic disputes: speed and consumption warranties, unsafe port claims, and hire deductions for time lost.
See also Off-Hire · Voyage Charter · Bareboat Charter
- Transshipment
Chartering
Moving cargo from one vessel to another en route, typically at a hub port from ocean-going ship to regional feeder. Efficient logistics in normal times, and a laundering device in abnormal ones: each transshipment can blur a cargo's origin, which is why sanctions monitors watch hub anchorages closely.
See also Feeder · STS (Ship-to-Ship) Transfer · Dark Fleet
U
- UKMTO
Security
The United Kingdom Maritime Trade Operations office, the Royal Navy's interface with merchant shipping in the Middle East and Indian Ocean. Ships report positions voluntarily; UKMTO issues warnings and advisories, and its incident alerts, numbered and timestamped, are often the first public record that something has happened at sea.
See also MICA Center · MSCHOA · High Risk Area (HRA)
- Underwriter
Insurance
The person or company that accepts a risk and sets its price. In marine insurance the lead underwriter negotiates terms and premium; following underwriters subscribe shares of the same slip. The name preserves the Lloyd's coffee-house practice of writing one's name under the risk description on the policy.
See also MGA (Managing General Agent) · War Risk · Reinsurance
V
- VLCC
Navigation
Very Large Crude Carrier: the two-million-barrel workhorse of long-haul oil, around 300,000 dwt. Too deep for many ports, VLCCs load and discharge at offshore terminals or by ship-to-ship transfer. A handful of fixtures a day set the tone for the entire crude freight market.
See also Suezmax · Worldscale · STS (Ship-to-Ship) Transfer
- Voyage Charter
Chartering
The carriage of an agreed cargo between agreed ports for a freight, usually per ton. The owner bears the voyage's costs and time risk at sea; the charterer bears port time through the laytime and demurrage regime. It is the workhorse contract of the bulk trades and the origin of most demurrage law.
See also Laytime · Demurrage · Time Charter
W
- War Risk
Insurance
Cover for loss caused by war, hostilities, mines, terrorism and piracy, excluded from standard hull policies since the world wars. Written as a separate policy with its own market and its own geography: entering a listed area triggers notice requirements and an additional premium priced per voyage, sometimes per day.
See also Listed Areas · Breach Premium · JWC (Joint War Committee)
- Worldscale
Chartering
The tanker market's pricing language: a schedule of nominal flat rates, in dollars per ton, for every conceivable voyage, recalculated yearly. Fixtures are quoted as a percentage of flat, WS80, WS220, so a single number can price any route and rise or fall with the market regardless of distance.
See also Spot Market · VLCC · Aframax
- Wreck Removal
Legal
The obligation to mark and remove a wreck that endangers navigation or the environment, made near-universal by the Nairobi Convention, which lets coastal states order removal and claim directly against the ship's insurer. Costs regularly exceed the lost ship's value many times over, making this one of the heaviest P&I exposures.
See also P&I Club · Constructive Total Loss (CTL)
Y
- York-Antwerp Rules
Legal
The internationally agreed code, first assembled in 1877 and periodically revised, that defines what sacrifices and expenditures qualify as general average and how contributions are calculated. Incorporated by reference into virtually every charter party and bill of lading, they give a medieval principle a uniform modern arithmetic.
See also General Average · Average Adjuster