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> fibre connections to other sites that are hopefully out of range of the jamming.

I guess it's not inconceivable that eventually there's a global clock network using a White-Rabbit-like protocol over dedicated fibre. But if you have to worry about GPS jamming you probably have to worry about undersea cable cutting too.



> But if you have to worry about GPS jamming you probably have to worry about undersea cable cutting too.

GPS jamming can be done by a random truck driver:

* https://www.cnet.com/culture/truck-driver-has-gps-jammer-acc...

Cutting cables at the bottom of the sea is an entire different class of attack (anchors notwithstanding).


Good thing cesium fountains are very accurate then...




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