a meter-high radar facility of the german air traffic control ("deutsche flugsicherung gmbh") is located at an altitude of above sea level in the forest district of nack. the system was built in 1973-74, and in 1975 was placed in operation by the "bundesanstalt für flugsicherung". the original red and white ring of parabolic antennas was slightly higher than the observation deck of the lemberg. since 1 january 1994, the facility has been owned by deutsche flugsicherung. in september 1998, it was replaced by a newer and smaller installation. this system monitors airspace in a radius of . the radar data are automatically transferred to the air traffic controllers in stuttgart, karlsruhe, zurich, frankfurt, munich, and friedrichshafen.