Shenyang, Nanchang and Zhengzhou were upgraded from secondary schools to aeronautical engineering institutes, and they are now major centers for avionics education. Coastal avionics plants in Tianjin, Nanjing and Shanghai were moved inland to Shaanxi and Guizhou provinces. The latest Chinese navigation system in the prototype F-8BM features INS with global positioning system (GPS) satellite links. Avionics Magazine delivers the best coverage of the worldwide aviation electronics industry. China still imports nearly all its civil airliners, which include Western avionics. These three merged and became the Beijing Institute of Aeronautics and Astronautics.