The Type 34As were equipped with a C/34Z analog fire-control director on the roof of the bridge that calculated the gunnery data using range estimates provided by the two stereoscopic rangefinders, one abaft the rear funnel and the other just behind the director. It transmitted the bearing and elevation data to the gun crews and then fired the guns simultaneously. A rangefinder provided data to the 3.7 cm AA guns while the 2 cm guns used a hand-held rangefinder.Koop & Schmolke, p. 40; Whitley, pp. 68, 71
