sentences:  The major components of the Mk 37 GFCS were the Mk 37 Director, and the equipment in the plotting room.The function of the Mark 37 director ("pictured") was to track the present position of the target in bearing, elevation, and range.To do this, it had optical sights (the rectangular windows on the front), an optical rangefinder (the tubes sticking out each side), and Fire Control Radar antennas.