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🚢 '''Hull and machinery insurance (H&M)''' is a core class of [[Definition:Marine insurance | marine insurance]] that covers physical damage to a vessel's hull, superstructure, machinery, and equipment arising from maritime perils such as collision, grounding, fire, explosion, and heavy weather. One of the oldest forms of insurance in existence — tracing its lineage to the marine underwriting practices that gave rise to [[Definition:Lloyd's | Lloyd's of London]] in the late seventeenth century — H&M remains a fundamental product for shipowners, operators, and financiers worldwide. The coverage attaches to the vessel itself as an asset, distinguishing it from [[Definition:Protection and indemnity insurance (P&I) | protection and indemnity (P&I)]] insurance, which addresses the shipowner's third-party liabilities, and from [[Definition:Cargo insurance | cargo insurance]], which protects the goods carried onboard.

⚙️ H&M policies are typically written on internationally recognized standard forms, most prominently the Institute Time Clauses – Hulls (ITC Hulls) published by the [[Definition:Institute of London Underwriters | Institute of London Underwriters]] (and its successor the [[Definition:International Underwriting Association (IUA) | International Underwriting Association]]) or the Nordic Marine Insurance Plan widely used in Scandinavian markets. Coverage is generally provided on a named-perils basis, and key policy terms include the [[Definition:Agreed value | agreed value]] of the vessel, the [[Definition:Deductible | deductible]] (often called the "franchise" in marine terminology), and specific provisions for [[Definition:Total loss | total]] and [[Definition:Constructive total loss | constructive total loss]], [[Definition:Particular average | particular average]] (partial damage), and [[Definition:General average | general average]] contributions. Underwriting an H&M risk requires evaluation of the vessel's age, classification society status, flag state, trading area, and the operator's safety record. London, Singapore, Hong Kong, and the Nordic markets are the principal global centers for H&M underwriting, with [[Definition:Reinsurance | reinsurance]] capacity drawn from both traditional reinsurers and [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] markets.

⚓ H&M insurance is strategically vital not only to shipowners but to the broader maritime economy. Vessel financing depends on adequate hull coverage — banks and lessors require it as a condition of ship mortgage agreements — and maritime regulators in many jurisdictions mandate minimum insurance standards. The H&M market is inherently cyclical, with [[Definition:Premium | premium]] rates driven by global fleet growth, claims trends (including large casualties and [[Definition:Catastrophe | catastrophe]] events such as port explosions or blockages), and the ebb and flow of [[Definition:Underwriting capacity | underwriting capacity]]. In recent years, H&M underwriters have grappled with emerging risks including [[Definition:Cyber risk | cyber threats]] to vessel navigation systems, decarbonization-related technology (such as alternative fuel propulsion), and the impact of [[Definition:Climate change | climate change]] on sailing routes and weather severity. Despite these evolving exposures, H&M insurance retains its position as one of the foundational pillars of the global [[Definition:Specialty insurance | specialty insurance]] market.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Marine insurance]]
* [[Definition:Protection and indemnity insurance (P&I)]]
* [[Definition:Total loss]]
* [[Definition:General average]]
* [[Definition:Hull war risk insurance]]
* [[Definition:Cargo insurance]]
{{Div col end}}

Definition:Hull and machinery insurance (H&M) - Revision history

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