After having food and alcoholic drinks the three left the bar/grill after sunset and headed up stream.  Operator had recently installed $20,000.00 worth of new electronic equipment on the boat and was navigating back using the electronics.  Operator was at the helm and Occupant1 was next to him on his left, Occupant2 was asleep on a seat to the left of the helm.  Operator state that the electronics were not working properly.  After coming out of the slow no wake zone at Kinni Park Operator powered the boat up and navigated the boat into a vertical rock wall on the WI shoreline within the Kinni Park boundary.  The impact with the rock wall catapulted all three people down into the cabin of the boat killing Occupant2, severely injuring Operator, Occupant1 sustained very minor injuries.  Estimated speed was approximately 30 to 35 mph.
Clifton