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Ghost ships, crop circles, and soft gold: A GPS mystery in Shanghai | MIT Technology Review
https://www.technologyreview.com/2019/11/15/131940/ghost-ships-crop-circles-and-soft-gold-a-gps-mystery-in-shanghai/
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A sophisticated new electronic warfare system is being used at the world’s busiest port. But is it sand thieves or the Chinese state behind it?
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