4:02, I responded to inc. loc. on a report of a female with a head injury. Upon arrival, operator of V-1 was concious and alert. She advised that while sailing the boom got loose and swung across striking her on top of her forehead. She advised she was bleeding but never lost consciousness. We transported her to the dock where Amb 1 was waiting to treat her injuries. She was transported to SSMC-ER where she was treated and discharged.