Instability of GPS is cause for cooperation

Chinese experts said greater cooperation on global navigation satellite systems is needed to avoid widespread problems if one of the systems fails.

Currently, only the US Global Positioning System (GPS) is working, while Russia is restoring GLONASS, and Europe and China are starting to build their own systems.

"If countries could strengthen cooperation, one system's failure will not have a major impact when there are other systems in place," said Cao Chong, a leading expert with China's Association of Global Navigating Satellite Systems.