RedactedNarrative: On 07/27/2015, at about 02:00 p.m., this vessel was cruising/sailing on San Juan Channel, near Friday Harbor, WA located in San Juan county. 
  
  Operator was operating his sailboat with two other passengers on board.  According to Operator, he was under sail power and was going with the wind with the boom on the main sail off of the port side of his vessel.  Operator was just leaving Friday Harbor and was by Brown Island in San Juan Channel.  Operator said that he saw the ferry coming and changed course to the left.  He said that at the time he was worried about the ferry and did not pay attention to the boom that swung to the right as the wind caught it from the course change.   
  
  A passenger of his, Occupant, was standing on the seat on the starboard side of the vessel.  When the boom swung to the right it hit her in the head.  Occupant explained that her head was sore and she was dizzy for a couple of days.  She said that after a couple of days she was so dizzy that she could not walk without assistance.  Occupant first went to the doctor's office, who quickly told her that she needed to go to the ER.  She suffered a concussion and possible damage to her ear drum.
  
  1 Injury / 0 Fatalities
  There was no apparent alcohol involvement
  There was no vessel damage
  Both the Operator and Injured were wearing PFDs
  The Operator did have a mandatory Boater Education Card
   