Second launch of the small solid-fuel CZ-11 launch vehicle from Jiuquan. It carried the 240 kg Maichong Xing Shiyan Weixing (Pulse Star Experimental Satellite) which will test the concept of navigation using the signals from X-ray millisecond pulsars. These compact stars spin hundreds of times a second and the X-ray flashes from their magnetic poles swishing past us at that high rate can be used as a very accurate clock, the key component of a GPS-like navigation system. The concept was developed some years ago by the NRL team and it was hoped to use it in future US space systems. The launch also carried four cubesat-class payloads.