RedactedNarrative: Operator was transporting his boat from Florida to Warwick RI.  He started to smell smoke but thought it was from a camp fire on shore.  Later he noticed smoke drifting by his running lights, we went down from the flybridge and opened the cabin.  He found the cabin full of smoke.  He exited the boat into his dingy and called for assistance.  The boat burned to the waterline and sunk during firefighting operations.  He was not inured in the incident was was transported to shore by the USCG.