RedactedNarrative: On November 13, 2016, subject was attempting to dock his vessel, a 34 ft Chaparral cabin cruiser, at Grandview Palace Yacht Club. Operator, was inexperienced with this vessel, was attempting to back into a slip between two other vessels.  He was backing up too fast and then got confused and increased throttle instead of decreasing throttle, causing the vessel to speed up. The vessel struck a post and two other vessels. Operator’s wife was standing on the swim platform attempting to help him secure the boat at the time of the accident and her hand got caught between the two vessels as they collided. She suffered an amputation of one of her fingers and was transported to Mount Sinai Medical Center for treatment.