Ghost ships, crop circles, and soft gold: A GPS mystery in Shanghai
Yet another navigational hazard:
https://www.technologyreview.com/s/614689/ghost-ships-crop-circles-and-soft-gold-a-gps-mystery-in-shanghai/?utm_medium=10today.ad3li.20191115.421.1&utm_sourc e=email&utm_content=article&utm_campaign=10-for-today---4.0-styling
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