Hull, Cargo, Freight and Protection & Indemnity

Key Takeaways

  • Hull protects the vessel interest.

  • Cargo protects qualifying goods during the described transit.

  • Freight insurance protects the insured shipping-revenue interest.

  • P&I addresses selected maritime liability rather than direct hull damage.

Last updated: October 2026

Hull, Cargo, Freight and Protection & Indemnity

Note

Ocean marine is the oldest recognized form of commercial insurance, dating back to 14th-century Mediterranean trade and formalized at Lloyd's Coffee House in London. Ocean marine contracts operate under federal admiralty jurisdiction and ancient maritime customs distinct from standard state property-casualty contracts.

Maritime commerce involves severe environmental hazards, international jurisdictions, and massive financial investments in ships and cargo. Ocean marine insurance provides four interrelated coverage lines designed to protect vessel owners, cargo owners, and shipping operators against perils of the sea and catastrophic liabilities.


The Four Core Ocean Marine Coverages

Coverage LineInsured Subject MatterPrimary Perils & ProvisionsKey Exclusions & Boundaries
Hull InsurancePhysical structure of the vessel, machinery, boilers, and tacklePerils of the sea, fire, jettison, Inchmaree Clause, Running Down Clause (RDC)Cargo, crew injuries, and collision with fixed objects (piers, docks)
Cargo InsuranceGoods, commodities, and merchandise shipped by seaOpen Cargo or Voyage Policy, Warehouse-to-Warehouse clause, perils of the seaInherent vice, improper packing, ordinary leakage, and delay
Freight InsuranceShipping charges and vessel revenue earned upon deliveryLoss of freight revenue if voyage is aborted by covered sea perilsNon-covered commercial disputes or shipper cancellation
Protection & Indemnity (P&I)Maritime liability of the vessel owner/operatorJones Act crew injuries, passenger liability, damage to docks/piers, oil pollutionDirect hull damage and cargo owned by the vessel operator

1. Hull Insurance & The Running Down Clause

Hull insurance protects the vessel owner or operator against physical damage to the ship itself, including its hull, propulsion machinery, boilers, navigational electronics, and tackle. Hull policies are typically written on a valued basis.

  • Perils of the Sea: Hull forms cover catastrophic natural perils encountered on navigable waters: heavy weather, violent waves, stranding, collision, sinking, and lightning, as well as fire, jettison, and barratry (fraudulent criminal acts committed by the master or crew).
  • The Inchmaree Clause: Named after the landmark 1887 British case Thames and Mersey Marine Insurance Co. v. Hamilton, Fraser & Co. involving the steamship Inchmaree, this clause expands coverage beyond traditional perils of the sea. It covers physical damage to the hull or machinery resulting from bursting of boilers, breaking of shafts, latent defects in machinery or the vessel structure, and navigational or operational errors of the master, officers, or crew, provided the loss did not result from a lack of due diligence by the vessel owner or managers.
  • The Running Down Clause (RDC) / Collision Liability: A standard hull clause that provides third-party property damage liability coverage if the insured vessel collides with another ship or vessel. The insured fraction and collision limit depend on the selected clause; historical forms can use three-fourths liability, while others use full liability. A hull limit alone does not establish the collision payment. The clause and covers the insured's legal liability for physical damage to the other vessel and its cargo, including loss of use. Critical Boundary: The traditional ship-to-ship RDC described here excludes collision with fixed or floating objects (piers, wharves, bridges, dolphins, or buoys), nor does it cover bodily injury, loss of life, or environmental pollution.

2. Cargo Insurance & Warehouse-to-Warehouse Coverage

Cargo insurance protects the owner of commodities, raw materials, or manufactured products while being shipped across navigable waters. Cargo policies are written either as an Open Cargo Policy (which attaches to qualifying declared shipments under its terms) or a Voyage Policy (covering a single specific shipment). Warehouse-to-warehouse transit and post-discharge termination depend on the cargo clause and any storage extension; there is no universal domestic/foreign deadline.

  • Inherent Vice Exclusion: Cargo policies exclude loss resulting from inherent vice—the natural, internal propensity of a commodity to deteriorate, rot, decay, or self-combust without any external peril (e.g., fruit spoiling due to natural aging, spontaneous heating of damp grain, or steel rusting from ambient air moisture).

3. Freight Insurance

In maritime commerce, freight refers to the compensation or shipping revenue paid to the vessel owner for transporting goods. Whether freight remains earned after a casualty depends on the carriage contract and applicable law. Freight insurance addresses the insured freight interest put at risk by the covered event. Freight Insurance indemnifies the carrier for this lost revenue.

  • When freight is paid on a freight collect basis (due upon arrival), the carrier holds the insurable interest and buys Freight Insurance.
  • When freight is prepaid non-refundable by the shipper, the shipper bears the risk of loss and includes the freight charges in the insured value of the cargo under its cargo policy.

4. Protection and Indemnity (P&I) Insurance

Protection and Indemnity (P&I) insurance is marine liability coverage originally developed by mutual shipowner associations known as P&I Clubs. P&I covers maritime liabilities excluded under Hull insurance and the Running Down Clause:

  • Crew Injuries & Maritime Law: Determine whether the worker is a qualifying seaman, a Longshore worker or a state-compensation employee. Seaman injury exposures can include these maritime doctrines, with P&I protection subject to the issued contract:
    1. The Jones Act (Merchant Marine Act of 1920, 46 U.S.C. § 30104): Allows injured seamen to bring a tort action with trial by jury against their maritime employer for negligence, operating under a pure comparative fault standard.
    2. Maintenance and Cure: A generally fault-independent maritime obligation, subject to its legal prerequisites and defenses, to provide daily living expenses ("maintenance") and comprehensive medical treatment ("cure") to any crew member injured or fallen ill while in service of the ship, regardless of fault, until maximum medical improvement (MMI) is achieved.
    3. Warranty of Unseaworthiness: Strict liability imposed on shipowners to furnish a vessel, crew, and appurtenances reasonably fit for their intended purpose.
  • Passenger & Stevedore Liability: Bodily injury, illness, and baggage loss sustained by passengers, harbor workers, longshoremen, and marine visitors.
  • Damage to Fixed and Floating Objects (FFO): Third-party property damage caused by the insured vessel striking fixed structures—such as docks, wharves, piers, dolphins, locks, bridges, buoys, and underwater communications cables (risks excluded by the Hull RDC).
  • Cargo Legal Liability: Liability for loss or damage to cargo carried on board the insured vessel resulting from negligent handling or stowage, subject to statutory limits under the Carriage of Goods by Sea Act (COGSA).
  • Pollution & Wreck Removal: Environmental liabilities under the Oil Pollution Act of 1990 (OPA 90) and the Clean Water Act, including containment, cleanup, covered civil penalties where insurable under the contract and law, and the cost of compulsory removal of shipwrecks mandated by governmental authorities.

Test Your Knowledge

Which ocean-marine interest concerns the vessel itself rather than shipped goods or shipping revenue?

A

Cargo

B

Hull

C

Freight

D

A financial guarantee bond

Sections you finish are checked off in the contents.