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    Re: A good clock for a few billion years
    From: David C
    Date: 2019 May 5, 21:06 -0700

    Geoff wrote

    Thanks for the link Frank, but I'm afraid the author (Sophia Chen) has a poor understanding of how GPS works, she wrote:

    This is actually how GPS works. Satellites pinpoint your location on Earth by precisely measuring how long it takes a radio signal to bounce from your phone back to space

    I  regularly read stories in the media which indicate that the author believes that there is two-way communication between a gps receiver and the satellites.

       
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