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As an interesting twist on this the Argos system used for tracking
whales, polar bears and ocean current beacons does involve the tracker
transmitting, it uses Doppler shift like an EPIRBs (COSPAS-SARSAT).
And yet often reporters and wildlife documentaries mistakenly call it
"GPS tracking".

On Mon, 6 May 2019 at 06:48, David C  wrote:
>
> 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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