RedactedNarrative: UNIT 1 (GIVE WAY VESSEL) WAS TRAVELING ON PLANE AT APPROXIMATELY 28MPH EAST FROM BUSSEY TOWARD BLACKHAWK POINT. UNIT 2 (STAND ON VESSEL) WAS TRAVELING AT 5 MPH (IDLE SPEED) FROM SUNSET TO LAKE VIEW. UNIT 1 STRUCK UNIT 2 AT DUSK TRAVELING AT A HIGH RATE OF SPEED FOR THE TIME OF DAY CAUSING SEVERE DAMAGE TO BOTH UNITS.