Uninsured and underinsured boater cover
The other operator's problem becomes yours.
Boat insurance is not universally required in the way auto insurance generally is, which means the proportion of vessels around you carrying no liability cover at all is higher than the equivalent on a road.
This section responds when someone else causes an injury and cannot pay for it. It is the same logic as the auto equivalent, and it is written more narrowly.
What it responds to
Injury to you, and generally to your passengers, caused by an operator who has no liability cover — or who has cover with a limit too small to meet the claim.
It steps into the place of the cover the other operator should have carried, which is why the amount available is usually tied to the limit you chose for it rather than to anything the other party did.
Underinsured is the more common of the two situations and the less understood. A boat with a modest liability limit is far more common than one with none at all, and a serious injury exhausts a modest limit quickly.
How it differs from the auto version
The auto equivalent frequently includes property damage as well as injury. On the water, cover for damage to your own vessel caused by an uninsured operator is often not part of it — that damage is generally handled by your own physical damage cover instead.
So the practical answer to a collision with an uninsured boat is usually a hull claim on your own policy, with the deductible that applies to it, and this section reserved for injuries.
It also means the two sections can respond to a single incident at once, on different terms, which is worth understanding before rather than during a claim.
When the other vessel does not stop
Identifying a vessel that leaves is materially harder than identifying a car. There is no plate at eye level, wakes do not hold marks, and witnesses are moving.
Policies differ on whether cover responds when the other vessel is never identified, and some require some form of corroboration. This is a wording question rather than a limit question, and it is a fair one to ask when comparing.
Practically: registration numbers, photographs, and the names and contact details of anyone who saw it matter more on the water than they do on a road, because there is less of a trail afterwards.
Whether to carry it
It is generally one of the less expensive sections of the policy, and it responds to the scenario the rest of the policy cannot help with — someone else's fault, and nothing behind it.
The case is strongest if you regularly carry passengers, because the cover typically extends to them and their claims are not yours to control.
The case is weakest if the boat is rarely in company. Even then, the section that responds when someone else has nothing is an odd one to remove for a small saving.
Common questions
Not universally. Requirements commonly come from a lender or a marina rather than from law, which is why the share of vessels carrying no liability cover is higher than on a road.
Often not. Cover for damage to your own vessel from an uninsured operator is usually handled by your physical damage section, with its deductible, while this section responds to injuries.
Policies differ on unidentified vessels and some require corroboration. Registration numbers, photographs and witness details matter more on the water because there is less of a trail afterwards.
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This page is general information, not advice about your specific circumstances. A licensed insurance professional can tell you what’s actually available to you.
General information only, not insurance advice. Coverage, availability, and terms vary by insurer and by state, and are subject to underwriting. Quote My Policy LLC is a licensed insurance producer. Nothing here binds coverage.