Is boat insurance mandantory in nc?

Contact your states dept. of insurance, if not mandatory, (if a lien on it most certainly the lien holder would require it), would still be wise to carry at least liablity.

No, its not required by law, in most states. You'll have to check with your department of motor vehicles where you register the boat. You do have to have a title and registration for boat and trailer because of them being on the roads. If you find that you need an insurance policy you can get a quote