The mental model

Ocean marine covers everything related to ships, the cargo they carry, and the third-party liabilities of operating ships. It splits into hull (the ship), cargo (the goods), P&I (third-party liability), and war (a separate class historically peeled off because of the size of the exposure).

The line has its own legal heritage. The Marine Insurance Act of 1906, an English statute, codified the principles of marine insurance and remains foundational across most of the marine market. Doctrines like utmost good faith, warranty, deviation, and seaworthiness come from English marine law and apply with full force to modern marine contracts. The institute clauses (Institute Cargo Clauses A, B, C; Institute Time Clauses Hulls; etc.) are standardized wordings drafted by the London market and used globally as the base policy form, often with modifications. None of this looks like the US admitted property market. Most of it predates the US admitted market. Working in ocean marine means working with these conventions, and the conventions reward precision.

Hull insurance

Hull coverage protects the ship itself: the vessel, its machinery, and its equipment. Hull policies are typically written on Institute Time Clauses Hulls (ITCH) or American Hull Form, with major variations.

What hull covers

• Total loss and constructive total loss (where repair cost exceeds the insured value)
• Partial loss / particular average
• Collision liability (typically with a sister-ship clause and a 3/4 collision liability share, with the remaining 1/4 covered by P&I)
• General average contribution (the ship's share of a general average loss)
• Salvage and salvage charges
• Sue and labour expenses (costs incurred to minimize loss after a covered peril)

Time vs voyage policies

A time policy covers the vessel for a defined period (usually 12 months). A voyage policy covers a single voyage from a defined origin to a defined destination. Most commercial hull is written on time. Voyage policies are more common for cargo and for delivery voyages.

Warranties

Marine policies operate on warranties that, if breached, can void coverage from the date of breach. Common warranties include trading limits (defined geographic areas the vessel may operate in), towage warranties (rules about towing other vessels), and laid-up warranties (vessel out of service, with reduced premium and reduced coverage). Breach of a marine warranty can be more consequential than breach of a similar provision in non-marine policies.

Cargo insurance

Cargo coverage protects the goods being transported, regardless of mode (typically water but increasingly inclusive of land and air transit too). Most modern cargo is written on the Institute Cargo Clauses (ICC) of the London market.

The three Institute Cargo Clauses

Open cargo policies

For shippers with regular cargo movements, an open policy automatically covers all shipments meeting defined parameters during the policy period. Premium is reported and adjusted periodically. Avoids the per-shipment policy issuance burden. Standard for most large shippers and cargo brokers.

FPA / WA distinction (older terminology)

Older cargo wordings used "Free of Particular Average" (FPA, now ICC C) and "With Average" (WA, now ICC B) terminology. Both are largely replaced by the modern ICC clauses, but the older terms still surface in legacy contracts and bills of lading.

Protection & Indemnity (P&I)

P&I covers the shipowner's third-party liabilities arising from operating the ship. Crew injury, passenger injury, cargo claims (where the carrier is liable to cargo owners), pollution, wreck removal, collision liability not covered by hull (typically the 1/4 share), fines and penalties.

Why it is mutual

P&I is overwhelmingly written by mutual associations called P&I Clubs. The clubs are owned by their members (shipowners) and operate on a not-for-profit basis. The mutual structure exists because P&I exposures are large, lumpy, and benefit from shared risk and active claims handling expertise.

The International Group

Thirteen major P&I Clubs are members of the International Group of P&I Clubs, which together cover roughly 90% of the world's ocean-going tonnage. The IG operates a pooling and reinsurance arrangement that provides extremely high limits ($1B+) of P&I cover backed by the collective resources of the member clubs and external reinsurance. The IG structure is one of the largest mutual reinsurance arrangements in any line of insurance.

Coverage breadth

P&I covers a wider range of liability exposures than most casualty forms because the shipowner faces a wider range of liabilities. Crew claims under the Jones Act and various international labor regimes; cargo claims under the Hague-Visby Rules and other international conventions; passenger claims under the Athens Convention; pollution under MARPOL and various national regimes; collision liability not within the hull policy's collision clause; fines and penalties in foreign jurisdictions. The breadth is part of why mutual structures work: only an entity with deep marine claims expertise can handle the range.

War risks and political perils

War risks were historically excluded from standard hull and cargo policies because of the magnitude and concentration of potential loss. The exclusion is then bought back through specialist war risks markets at additional premium.

The standard war exclusion

Most marine policies exclude war, civil war, hostile acts, capture, seizure, arrest, detention, and similar perils. The exclusion is broad and consistent across cargo and hull forms. War risks markets write coverage specifically for these excluded perils.

The Joint War Committee listing

The Joint War Committee (JWC) is an industry body that maintains a list of areas where the war risk is heightened. Vessels entering JWC-listed areas typically pay additional war risk premium ("breach premium" or "Additional Premium areas"). The list is updated regularly as geopolitical conditions change. Recent listings have included parts of the Black Sea, the Gulf, parts of West Africa, and Southeast Asian piracy zones.

Strikes, riots, and civil commotion

SR&CC and similar political perils are typically covered separately from war risks proper, often through endorsements to the standard policy. The line between war and SR&CC matters because some events fall in one bucket and not the other. Recent coverage litigation has focused on the line between cyber events and war for purposes of war exclusion (see Chapter 06 for the cyber market's response to this).

Institute clauses and English law

The Institute clauses are standardized wordings drafted by the London market (specifically the Joint Cargo Committee and Joint Hull Committee). They are the global default for marine policies, used as base wordings or as the framework for modifications. Working in marine means working with these clauses constantly.

Major Institute clauses

• Institute Cargo Clauses A, B, C (the three coverage tiers above)
• Institute Time Clauses Hulls and Institute Voyage Clauses Hulls
• Institute War Clauses (separate cargo and hull versions)
• Institute Strikes Clauses
• Institute Frozen Food Clauses (for refrigerated cargo)
• Institute Trade Clauses (for specific trade routes)

English law and jurisdiction

Most marine contracts choose English law and English jurisdiction for dispute resolution. The Marine Insurance Act 1906 governs. London arbitration handles many disputes. For US-domiciled risks, this can be confusing because the US has its own marine law (built on common law and the Carriage of Goods by Sea Act). Marine practitioners learn to work in both regimes.

General average and salvage

Two doctrines of marine law worth knowing because they show up in every major marine claim.

General average

When a ship encounters a peril, the master may make a deliberate sacrifice (jettisoning cargo, deliberately running aground) to save the rest of the venture. The York-Antwerp Rules govern general average. The principle: the loss is shared proportionally among all interests that benefit from the sacrifice. The shipowner contributes (for hull value), each cargo owner contributes (for the value of their saved cargo), and the freight contributes (for unearned freight). Hull and cargo policies cover the insured's general average contribution as a defined benefit.

General average claims are administered by general average adjusters (specialists who calculate each interest's contribution). The process is slow, technical, and global. Cargo released from a general average matter often must post a general average guarantee or general average bond before discharge.

Salvage

When a third party (often a professional salvor) provides assistance to a vessel in peril, salvage law allows that party to claim a salvage award proportional to the value saved. The Lloyd's Open Form (LOF) is the standard salvage contract globally. SCOPIC clauses provide additional compensation for salvors who incur expense fighting pollution, even if the property salvage attempt fails. Salvage awards can be substantial, sometimes representing a meaningful percentage of the saved value.

Where the market sits

Most ocean marine business has historic and current connections to London. The geographic distribution of capacity and expertise has not changed as much as in other lines.

Major marine markets

• Lloyd's of London. The center of marine insurance for centuries. Major hull, cargo, war, and specialty marine syndicates.
• The London Company Market (IUA). Major non-Lloyd's London marine carriers, often co-subscribing with Lloyd's syndicates.
• The Nordic and continental European markets. Strong hull markets in Norway, Sweden, Germany, and France, particularly for shipowners headquartered in those regions.
• Asian markets. Singapore, Hong Kong, and Tokyo have grown as marine centers, especially for hull on Asian-flagged tonnage.
• US marine carriers. Specialty US marine writers (often part of larger carrier groups) cover US-domiciled cargo, inland marine adjacent classes, and some hull.
• P&I Clubs. The thirteen IG Clubs and a handful of fixed-premium P&I writers.

Distribution

Marine business almost always involves a specialist Lloyd's broker or marine wholesale broker. Retail brokers without marine expertise typically partner with marine specialists. The chain structure looks similar to the Lloyd's chain described in Chapter 09, with marine-specific specialists at each tier.

Where IDP earns its keep

Marine documents have a particular look and feel: institute clauses, bills of lading, charter parties, surveys, certificates of insurance, claims notices in marine vocabulary. The volume per cedent is high in the open cargo space; the format heterogeneity is also high.

Indico use cases

• Open cargo declaration ingestion. Convert shipper monthly declarations into normalized cargo bordereaux for the carrier.
• Vessel data extraction. Pull vessel particulars (IMO number, flag, classification, age, gross tonnage) from survey reports and class certificates.
• JWC area cross-check. Validate voyage data against current JWC listings to flag breach premium triggers.
• Bill of lading parsing. Pull cargo descriptions, values, ports, and consignee details from BLs into structured records.
• Marine survey summarization. Convert dense vessel surveys into structured underwriting inputs (condition, deficiencies, recommendations, last drydock).