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US races to develop AI-powered, GPS-free fighter jets, outpacing China
(interestingengineering.com)
This is a most excellent place for technology news and articles.
I worked in a place where the machine room had a network time device that connected to an attena getting gps reading to give time to all the other hosts. Im pretty sure any ntp server a host has configured is only a hop or two away from a device like this.