Each eight-inch turret had a Mk 30 rangefinder at the rear of the turret for local control, but they were normally controlled by two Mk 18 fire-control directors, one each on the fore and aft spotting tops.[20] A 20-foot (6.1 m) rangefinder was fitted on top of the pilothouse to provide range information for the directors.[22] Each group of three five-inch guns was controlled by a Mk 19 director, two of which were mounted on each side of the spotting tops.[23] Lexington received a RCA CXAM-1 radar in June 1941 during a brief refit in Pearl Harbor.