RedactedNarrative: Agfc was not notified of this accident until several hours after it happened and v1 was never located. When interviewed, the operator said he couldn't remember anything about that day.  He didn't know where he got v1 and he didn't know any of the people "he was with".  All he could remember is that v1 was black and possibly a yamaha.  Operator was jumping the wake of another unknown vessel and when he landed he hit his head on the steering console knocking him unconscious and lacerating his head.  He apparently was picked up by someone, taken to the hospital (where we located him) and received 15 stitches to his head.