China's domestically-produced navigation system aims to take 70-to-80-percent of the now GPS-dominated domestic market by 2020. A spokesman for the BeiDou Navigation Satellite System says the system will hold 15 to 20 percent of the market share by 2015. Ran Chengqi also announced that the BeiDou system began providing positioning, navigation, timing and short message services to civilian users in China and surrounding areas in the Asia-Pacific region on Thursday. China launched the first satellite for the BeiDou system in 2000, and a preliminary version of the system has been used in traffic control, weather forecasting and disaster relief on a trial basis since 2003. South Korea has formally submitted a claim to an extended portion of the continental shelf in the East China Sea to the United Nations. The report says the outer limit of the country's continental shelf extends to the Okinawa Trough.