RedactedNarrative: OWNER OF VESSEL ONE HAD TAKEn VESSEL TO SAND ISLAND TO HUNT.  OPERATOR WAS IN THE PROCESS OF UNLOADING HIS BOAT WHEN, DUE TO HIGH WINDS, THE VESSEL BEGAN TO DRIFT AWAY.  OWNER OF VESSEL WADED INTO THE WATER IN AN ATTEMPT TO RETRIEVE VESSEL BUT WAS UNABLE TO.  THE VESSEL DRIFTED AWAY FROM THE ISLAND STRANDING THE OWNER.  WITNESS SAW STRANDED OWNER AND ASSISTED HIM OUT OF THE WATER AND CALLED 911 FOR HELP.  AREA OF THE ACCIDENT WAS APPROX 1440 FT WEST OF THE CHISHOLM BOAT RAMP AND APPROX 708 FT SOUTH OF THE MASTER CONSERVACY TOWER. VESSEL WAS ONLY BEACHED AND WAS NOT ANCHORED OR MOORED AT THE TIME OF DRIFTING AWAY.