RedactedNarrative: V1 operated was traveling south in the Intercostal Waterway, approximately 20 mph. When it reached Stump Pass in Charlotte County near marker 17A a large unknown vessel was heading north creating a large wake. When V1 hit the wake on the Port side of the unknown vessel, occupant #1 who was sitting on the Starboard side of V1 was thrown from her seat and landed on the deck. Complaining of back pain she was taken to the hospital and treated.
  
  None of the four occupants were able to get the registration numbers or any other identifiers of the vessel making the large wake. V1 operator received a warning for not reporting the boating accident within the required time limit.
   
  Congested waters was the cause.
  