not carried on all boats not carried on "Milch Cow" Tanker and supply u-boats Can use Magnetic or Contact Exploder Ballspiel was a gunnery radar for U-boats. Like most German radars at the end of the war, it was a development of Berlin. It had a range of 25km, but for practical gunnery only 8km was used. It had an azimuth accuracy of about 1 degree and a range accuracy of 500 meters. It is known that Ballspiel was used in active service, but there are no data about its effectiveness. Fitted After 1942 Fitted after September 1943 769 8,500 18 7 722 44-52