UNIT 2 WAS TRAVELING SOUTH ON THE ICW WITH A FRIEND A FEW YARDS AHEAD OF HIM AND UNIT 1 BEHIND THEM. AS THEY APPROACHED A LARGE VESSEL, UNIT 2 SLOWED DOWN AND SO DID THE FRIEND. UNIT 1 TRIED TO PASS BETWEEN THEN. UNIT 1 LOST CONTROL FROM THE OTHER 2 PWCS WAKES CAUSING UNIT 1 TO COLLIDE WITH UNIT 2. THE OTHER PWC WITH THE FRIEND DID NOT SEE/WITNESS ANYTHING.