RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHEN THE OPERATOR'S PRE-EXISTING MEDICAL CONDITION CAUSED HIM TO BLACK OUT AND LOSE VISION. THIS MEDICAL SITUATION CAUSED THE VESSEL TO IMPACT A DOCK ALONG THE SHORELINE. THERE WAS NO INJURIES FROM THE COLLISION, ONLY PROPERTY DAMAGE TO THE VESSEL AND DOCK.