RedactedNarrative: Operator was fishing on Guist Creek Lake when he noticed water filling the rear of his boat.  Operator stated that he then started his boat and was heading back to the marina. After Operator had gotten a short distance the rear of his boat filled with water and caused his boat to sink. Operator was wearing his PFD at the time of the accident Operator was picked up by another fisherman that was nearby. Operator told this officer that he did not know much about the boat or boating this was his second time out with this boat.