China's future satellite navigation will be millimeter accurate

On Sept. 29, China launched two Beidou 3 satellites from a Long March 3C rocket from the Xichang Satellite Launch Center in Sichuan province. Another two Beidou 3 satellites will launch before the end of 2017, part of a network of 20 Beidou 3 and 10 older Beidou 2 satellites set to go up by 2020. Civilian GPS receivers generally achieve higher accuracy by combining signals of several satellites, and indeed the completed Beidou Navigation Satellite System is expected to provide global coverage, with millimeter-level accuracy. More

(Source: Popular Science - Nov 8)