China gives school pupils smart watches to track their location using its satellite navigation system ...

Tests have confirmed advances in the maritime use of China's home-grown satellite navigation system, gains that could strengthen the ability of the country's submarines and underwater drones to mount stealth strikes, military specialists said China Shipbuilding Industry Corporation said underwater precision positioning tests conducted by its No 716 Research and Development Institute in waters off Lianyungang in Jiangsu province, proved that it had overcome a number of core technical problems with the BeiDou Navigation Satellite System CSIC, China's biggest state-owned naval shipbuilder, said the tests showed that the BeiDou system could not only provide accurate and consistent positioning data to underwater vessels, but could also send tracking and positioning information from underwater devices to shore-based and surface stations. Source