Web chatter indicates that the launch of a pair of BeiDou-2/Compass medium Earth orbit (MEO) satellites from the Xichang Satellite Launch Center will take place around April 23. This will be the first time that a pair of BeiDou-2/Compass satellites is launched on a single rocket. The satellites are designated M3 and M4. M1 is already in orbit, and M2 and M5 are expected to be launched in June.