Beijing Review

DIGITAL BIG DIPPER

Wang Chang still shudders to recall the day his boat nearly sank in the tropical waters off Hainan Island in south China. On that day in April 2015, Wang left his home in Qionghai, a city known for its fishing industry, heading out into the open ocean in search of fish. In the middle of the sea, realizing his vessel was in danger, he activated an emergency call button on the boat, which is equipped with a communication system linked to the BeiDou Navigation Satellite System (BDS). The system is named after the Big Dipper constellation.

It was this button that saved Wang’s life. When he

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