RedactedNarrative: According to a Coast Guard report, a 45-ft vessel traveling 7 nm off the Willapa entrance struck something in the water which caused his vessel to take on water and sink.  The operator noted that he struck his head on an unidentified object, which caused him to loss consciousness for an unknown amount of time.  Since the vessel lost most of its freeboard and the water was coming into the deck scuppers, the operator abandoned it in his 17-ft tender.  Judging from the sound, he believes it sunk after he departed.  He was checked out by EMS but refused further medical treatment.  He said he was conducting checks of his navigation system and auto-pilot at the time of incident.  His vessel is considerd a total loss, valued at 235k.