By Adam Rose BEIJING (Reuters) - China's homegrown satellite navigation system will bring untold economic, social and military benefits and other countries in Asia are welcome to use it, the director of China's satellite navigation agency said on Friday. The year-old Beidou satellite navigation system is a rival to the U.S. Global Positioning System (GPS) and Russian GLONASS. Beidou's 16 satellites serve the Asia-Pacific but the number of satellites is expected to grow to 30 by 2020 as coverage expands globally. The system would bring benefits across the board, in both civilian and military applications, said Ran Chengqi, the director of the Satellite Navigation Office.{br}{br}View the Entire Article{br}