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A comment on The World Economy Runs on GPS. It Needs a Backup Plan. Parent comment

Re:The World Economy Runs on GPS. It Needs a Backup Plan by empthought on Wednesday July 25, 2018 @09:35PM (#17614459)
100ms or more ping time as we wait for the signal to travel thousands of miles into space and back would also have something to do with it.
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Re:The World Economy Runs on GPS. It Needs a Backup Plan by echo-oddly on Wednesday July 25, 2018 @11:49PM (#17614929)
For reference, round trip time to geostationary orbit is 240 ms. But that is 36 thousand km. Compare that to the ISS which orbits less than 500 km up, so the round trip time is less than 1.25 ms.
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Re:The World Economy Runs on GPS. It Needs a Backup Plan by empthought on Thursday July 26, 2018 @12:23PM (#17618663)
No communications satellites orbit at such low altitude, though.
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