Marine basics

The Types of Marine Insurance, Explained

By Nymble Insurance LLC · Published October 16, 2026 · 2 min read

Marine insurance is a family of coverages rather than one policy. Hull insurance covers the vessel, protection and indemnity (P&I) or marine liability covers legal liability, cargo insurance covers goods in transit, and waterfront property coverage addresses docks and similar structures.

Hull and machinery

Covers physical damage to a vessel and its machinery from covered perils. For recreational boats it is paired with liability in a single policy; larger and commercial vessels often buy hull and liability as separate parts.

Protection and indemnity / marine liability

Responds when the owner or operator is legally liable for injury or damage to others, such as passengers, other vessels or property, and often includes defense costs. Crew liability may be handled separately.

Cargo

Covers goods in transit by sea, air or land. Cargo is insured by its owner, separately from the vessel, and a carrier's liability is typically limited. See our cargo basics.

Waterfront property

Docks, boathouses, boat lifts and seawalls need their own attention, since homeowners policies often limit them. See docks and lifts.

Who needs what

• Recreational boaters: hull and liability
• Charter and commercial operators: add passenger, crew and business coverage
• Importers and exporters: cargo
• Waterfront owners: structures and liability