RedactedNarrative: Single vessel accident; collision with submerged channel marker. On 081915 at approximately 1630 hours I, Officer, responded to a boating accident in Manatee County. At approximately 1600 hours, vessel FL 0070 GP struck a submerged channel marker (red # 4) while heading back to the Kingfish Boat Ramp. Owner and operator of the vessel7, described to me what happened. Operator said he was on the right hand side of the channel headed west to the boat ramp. His speed was between 15-20 mph. As he approached the normal position of red channel marker # 4, he saw a life jacket floating in the water. The life jacket was on the far right edge of the channel, the side he was cruising on. To avoid the life jacket, Operator sharply turned his vessel to the left (back towards the bridge). In doing so, the vessel's prop struck the submerged channel marker the life jacket was attached to. 
  
  The sudden deceleration from the collision caused subject to fly from her seat, in front of the center console, and strike the inside bow of their vessel. The collision did not shut the engine off, but it did create a significant shuttering vibration when the gear was engaged. After idling the short distance back to the ramp, Operator notified us (FWC) of the accident. After returning the boat to it's storage location, they went to Blake Medical Center where victim was treated for bruising and abrasions to hip and butt. Operator was uninjured and received no medical treatment. Subject was seated in center of boat just forward of center console. Vessel prop impact with submerged channel marker caused sudden deceleration, causing subject to be thrown forward in boat. Subject struck inside bow of boat with side of body.