Yard, yard's insurer...What it comes down to are the laws in CT.
seems to say that CT puts the burden on the property owner to check on the health of their trees because healthy ones don't just fall down.
Barts Connecticut Tree Service - Part 2
includes a longer quote from the CT insurance department " The tree owner is legally liable for the damage only if his negligence caused the tree to fall. Otherwise, it is an “Act of God” which would be covered under the neighbor’s Section I Property Coverage of the homeowners policy.If the tree falls on your own house, damage to the house is covered. The insurance policy covers the cost to remove the tree from the house. "
So the only real question would be if there were obvious signs that the tree was unhealthy (split, rotted, dying?) and of course, whether the tree was on the marina's property.
A real gentlemen might step up, if the insured value didn't cover the boat, the sales tax, the transport expenses, and make laHolland entirely whole for that. And, perhaps, throw in something extra to compensate for the time and expense that the new search will entail.
Unless it was ruled an Act of God, in which case you send the bill to...The Pope? The Imam of Jerusalem? (Oh yeah, they're all representatives of The One God, until it comes time to pay the bills.)