Apples and Oranges, Is There A
Safety Net?.
When policies become scarce and you begin to hear "only renewing existing policies", you might find new companies (whose names you do not recognize) eventually enter the market, especially through brokers. Watch for carriers that are not licensed in your state, but rather provide coverage through Lloyds of London. I am not knocking Lloyds of London, just mentioning that buyers should know what they are getting.
Also, check if the carrier that IS licensed in your state, is covered by an IGA (State run insurance guarantee association [where state insurance commissioner regulates insurer reserves, investments, risk, etc., BUT, in the event of multiple claims whereby the carrier becomes insolvent, the IGA will step-in and pay the carrier's outstanding claims]). I am not sure that all states have an IGA (I know PA does [PIGA], I think years ago
Texas did not; not sure about currently).
In 35 years I have experience with a few insolvent US based carriers with outstanding claims. Extra paperwork but the claims were paid (none were boats though).
Some carriers may have re-insurance, which is a consideration, if you have time to
research.
Other posts mentioned insurance acquired through the same carrier insuring their home, auto, etc. That is probably the smoothest path to coverage with a good carrier. Interesting example: about 15 years ago, NJ insurance commissioner stopped requiring carriers licensed in their state, to insure homes on the barrier islands, so they all non-renewed policies insuring barrier island homes. Some agreed to renew "if you already have a homeowner's policy with us elsewhere in NJ". Everyone else was stuck with Lloyds of London policies, without protection of NJ's IGA.
We all hope we will never have a claim, but it is good to know what you are
buying.