V1 DEPARTED FROM PUNTA GORDA AT 0800 HRS HEADED TOWARD CAPTIVA ISLAND. THEY WERE TRAVELING AT 9 KNOTS ACROSS CHARLOTTE HARBOR AND TURNED INTO PL SOUND WHICH BROUGHT THE WIND TO THE STERN. THE VESSEL WAS RIGGED WITH A CANVASS TENT SURROUNDING THE CABIN DURING THE TRANSIT WITH THE FRONT WINDOW VENTS OPEN. THE ENGINE EXHAUST WAS THE SOURCE OF CARBON MONOXIDE. THE OCCUPANT DESCRIBED A STATION WAGON EFFECT WHICH BROUGHT THE EXHAUST INTO THE CABIN. 
THE OCCUPANT WAS ON THE REAR DECK AND WENT UNCONSCIOUS AND BUMPED HIS HEAD AND FOREARM. HE REGAINED CONSCIOUSNESS AND REALIZED THAT HIS WIFE WAS IN A CONFUSED STATE. HE HAD HER TURN THE BOAT IN CIRCLES UNTIL FRIENDS ARRIVED AND SHUT THE ENGINES OFF. THE OCCUPANT BELIEVES IT WAS A NE WIND DURING THEIR TRANSIT. BOTH OCCUPANT AND OPERATOR WERE ADMITTED TO THE HOSIPTAL AND THEN RELEASED.
CAPTIVA ISLAND                