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Re:Drones that can haul a 20-pound load for 500 miles and la... by tfolbrecht on Sunday May 27, 2018 @08:13AM (#17166584)
Surprised nobodies mentioned celestial sensors.

Celestial navigation by imaging the sky, and combining that data with a clock and compass.

Re:Drones that can haul a 20-pound load for 500 miles and la... by varjag on Sunday May 27, 2018 @09:38AM (#17166841)
Very unreliable for ground based systems.