RedactedNarrative: Operator and occupant had been Cobia fishing in the Chesapeake Bay approximately 3-4 miles off Silver Beach, VA.  The vessel was heading hack to Gwynn's Island.  At approximately 13:24, Operator began to see smoke originating from the cabin.  He stopped the vessel and checked the source of the smoke and found flames in the back birthing area of the cabin.  The fire appeared to be fully involved over the fuel tanks.  Operator and occupant donned PFD and took an extra PFD each and activated their Garmin in-reach emergency beacon.  Both occupants swamp approximately 1/4 mile away from the burning vessel and were picked up by good Samaritan approximately 15 minutes later.