RedactedNarrative: Operator of Vessel A had a medical event while traveling from one fishing location to another.  Operator of Vessel A was thrown from Vessel A and was found .5 miles away from Vessel A which was still under power circling a distance of .5 miles before it was stopped.  Operator of Vessel A was found deceased face down in the water without a PFD.  Witnesses observed boat going in circles and called 911.