RedactedNarrative: Operator was operating boat east out of Kenosha harbor channel.  Operator had consumed an undetermined amount of alcohol and was possibly distracted by passengers, and claimed he engaged his boat’s auto pilot and increased throttle to turn north out of the harbor channel.  Operator claims the boat’s auto pilot was preset to put the rudders hard port which turned the boat into the south side of the north pier.  The port side bow of the boat struck the pier first with the port side rear striking the pier shortly after.  The damage to the boat was primarily along the port side rub rail and just below it.  Operator then operated the boat away from the sea wall and continued operating north on Lake Michigan towards Racine WI.  Operator was contacted by the U.S. Coast Guard later that evening and arrested for BUI.  No injuries were reported.