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Re:Casio G-Shock time sync radio by tw1984 on Thursday August 17, 2023 @12:56AM (#37157429)
> GPS signals are much higher frequency and very low power and thus don’t work indoors.

With a $20 antenna placed near the window, together with a modern receiver, it is easy to get nanosecond level of precision for GPS systems. Some receivers even have in-door precision specification.

GPS not only work indoors, in terms of timing, it works actually pretty well indoors.

Re:Casio G-Shock time sync radio by 2rsf on Thursday August 17, 2023 @05:19AM (#37159156)
Why would I need that for? nanosecond accuracy? GPS indoors?
Re:Casio G-Shock time sync radio by tw1984 on Thursday August 17, 2023 @10:21AM (#37162056)
e.g. to get yourself a stable frequency standard that can be used in all kinds of electronics projects & equipments.