RedactedNarrative: On Wednesday, 1/15/14, Operator1 was operating his 34 foot Sea Ray cabin motorboat (V-1) traveling from Naples south to Marco Island with a total of 5 persons on board. Operator1 was southbound at 26 mph in the marked navigational channel approaching Johnson Bay. At the north end of Johnson Bay, the channel makes an approximate 90 degree turn to the east. While attempting to negotiate this turn, Operator1 exited the navigational channel and struck a shoal. V-1 came to an abrupt and immediate stop causing two passengers to be thrown across the deck, through the open cabin door, and into the cabin area of the vessel. Both impacted the floor and/or forward bulkhead of the cabin and were injured, one seriously. 
  
  Operator1 admitted to operating the vessel and other passengers identified him as the operator. Operator1 stated he was well experienced in boating and was very familiar with the area. The shoal is well known to local boaters and well marked on both the navigational charts and most GPS units. 
  
  The GPS on V-1 was powered on and working at the time of the accident. The track from the GPS was downloaded and consistent with the statements given. 
  
  My investigation concluded that Operator1 violated USCG Navigation Rules #2 (Responsibility), #5 (Proper Lookout), #6 (Safe Speed), and #8 (Action to Avoid Collision). Operator1 also violated F.S. 379.2431(2), F.A.C. 68c-23.023(1)(D)(3), violation of manatee zone (on plane outside channel). 
  
  
  Injured1 was seated prior to the accident. Upon impact, she was thrown through the open cabin door and down the steps, landing on her head/neck. She suffered numerous contusions throughout her body and suffered soft tissue damage to her right shoulder. When I met with her several weeks after the accident she was unable to move her right arm and still undergoing testing to determine the extent of injury.; Injured2 was standing on the deck of V-1 when it impacted the sandbar. She was thrown through the cabin door, down and across the cabin, and impacted the front side of the cabin. Injured2 suffered brain hemmoraging, a broken C-7 vertebrae, a broken nose, a laceration to her ear, and other bumps and bruises.