Time is distance…

In today’s introductory orientation I mentioned semaphore – a short message could now “travel” at 6km per minute.  Then I discovered this  – errors of 20ms – or at the speed of light c6000 Km!
GPS “spoofers” — devices that create false GPS signals to fool receivers into thinking that they are at a different location or different time — could be used to defraud financial institutions, according to Todd Humphreys from the University of Texas

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