RedactedNarrative: VESSEL 1 WAS TOWING A PASSENGER ON A TUBE OUTSIDE OF DUCK CREEK.  VESSEL 2 WAS DRIFTING IN THE SAME AREA.  VESSEL 1 OPERATOR TURNED TO LOOK BACK AT THE PERSON TOWED ON THE TUBE, FAILED TO SEE VESSEL 2 AND STRUCK VESSEL 2.  VESSEL 1'S STARBOARD SIDE NEAR THE BOW STRUCK VESSEL 2 NEAR THE BOW ON THE STARBOARD SIDE AND OVERRODE THE TOP OF VESSEL 2 ALONG ITS STARBOARD SIDE. BOTH UNITS LEFT THE SCENE AFTER AGREEING TO MEET AT UGLY JOHN'S MARINA TO MAKE AN ACCIDENT REPORT.  AREA OF THE ACCIDENT WAS ESTIMATED TO BE APPROX 2670 FT EAST OF FISHTAIL COVE POINT AND APPROX 1205 FT SOUTH OF COVES DRIVE POINT AND APPROX 3159 FT NORTH OF DREWS DRIVE POINT.