Ghost ships, crop circles, and soft gold: A GPS mystery in Shanghai

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?

https://www.technologyreview.com/s/614689/ghost-ships-crop-circles-and-soft-gold-a-gps-mystery-in-shanghai/?utm_source=newsletters&utm_medium=email&utm_campaign=the_download.unpaid.engagement