视频大致内容：
China is developing an independent satellie navigation system called Beidou. It"s the third country after the US and Russia to have such a system developed on its own.
At the first China Satellite Navigation Annual Academic Conference in Beijing, the chief designer says the system will cover the whole world by 2020 and he hopes Beidou will become the most competitive navigation system on earth.
According to Sun Jiadong, the system is being completed in 3 stages.
The first stage consisted of 3 satellites. It"s been offering navigation services, mainly for customers in China, since 2000.
The project is now in its second stage, which is to build 35 satellites to cover China and the entire Asia-Pacific region by 2012.
The last stage is to offer services to customers world wide.
The system provides communication services as well as navigation. The special feature has been used during rescue operations following the Wenchuan and Yushu earthquakes.
Sun Jiadong, Chief Designer, Beidou Navigation System, said, "Many organizations have been using our system for a while, and they like it very much. For example, fishermen can use the system for navigation, and to send text messages to their families. All this can only happen in China."
Sun Jiadong says the next 10 years is crucial for development. He hopes Beidou will become the most competitive navigation system on earth.
（文本为视频大致内容，可能与视频并非完全一致，欢迎大家贡献听写稿^^）
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