John Allen wrote:
> Richard B. Gilbert wrote:
>
>> It should not matter which satellites your site is using, they all
>> keep the same time to within nanoseconds!
>
>
> To satisfy my curiosity without effort on my part, can someone tell me
> where the GPS satellites actually get their time from?
>
> John
>
>
> --
>
> John Allen
> Bofferdange, Luxembourg
> allen{at}vo{dot}lu
> http://www.homepages.lu/allen
The Navstar (GPS) satellites have atomic clocks (cesium) on board.
These clocks are monitored and controlled by a ground station.
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