Maritime Insurance Explained: H&M, P&I, War Risk and Loss of Hire

The core covers

Marine insurance is the oldest form of commercial insurance and still the most misunderstood by the people who buy it. The confusion is structural: cover is split between two very different markets — commercial hull underwriters and mutual protection and indemnity clubs — and the boundary between them is not intuitive.

Hull & Machinery

H&M responds to physical loss or damage to the vessel from insured perils — heavy weather, grounding, collision, fire, machinery damage under certain conditions, and so on, depending on the clauses.

Key features owners must understand:

• The deductible. Applied per event; a large deductible reduces premium and shifts small claims to the owner.
• Machinery damage cover is not automatic in every form and often carries its own conditions and a separate deductible.
• Collision liability is typically covered in part by H&M (often three-fourths, historically) with the balance falling to P&I — one of the more counter-intuitive splits in the market.
• Warranties and conditions including class maintenance, trading limits and ice warranties. Breach can prejudice cover.
• Salvage and general average contributions.

Protection & Indemnity

P&I clubs are mutuals: owners are members, not customers, and they contribute calls rather than pay premiums. Cover spans liabilities that arise from operating a ship:

Wreck removal and pollution are why P&I limits are extremely high and why the International Group pooling and reinsurance arrangements exist.

War Risk

Standard marine policies exclude war and related perils, so war risk cover is bought separately. Two features dominate:

1. Listed areas. Underwriters designate areas where an additional premium applies, notified before entry, priced per transit or per period.
2. Rapid repricing. Rates in affected regions can move quickly, and areas can be added at short notice.

Since 2023 this has been a live routing input rather than a background cost, particularly around the Red Sea and Gulf of Aden. Owners routing through affected areas must factor additional premium, crew consent and, in some cases, security measures into the voyage economics — set against the cost of the longer Cape routing.

Loss of Hire

LOH pays a daily amount for time lost following an insured physical damage event, after a deductible expressed in days. It does not cover commercial idleness or off-hire from causes other than the insured damage.

The critical parameter is the deductible period. If a fleet's typical repair event lasts eight days and the LOH deductible is fourteen days, the cover almost never responds. Review the deductible against actual off-hire history rather than against the premium saving.

The gaps owners discover late

The first line is the most common administrative failure in ship management. The SHIPMAN-type liability architecture assumes the manager is a co-assured with subrogation waived; if that was never arranged, the whole structure behaves differently when a claim arrives.

Managing insurance well

1. Treat loss prevention as the premium strategy — claims record drives renewal
2. Review deductibles against actual claims history annually
3. Confirm co-assured status and subrogation waivers for managers and charterers as required
4. Keep class and statutory certification impeccable; it underpins cover
5. Notify claims promptly and preserve evidence — late notification prejudices recovery
6. Maintain a claims register with cause analysis, not just amounts
7. Brief masters on immediate steps after an incident: preserve records, protest, notify