3 ms·
So do non-GPS plain old longwave and shortwave radio clocks - https://en.wikipedia.org/wiki/Radio_clock https://en.wikipedia.org/wiki/Radio_clock
by jodrellblank 7y ago
So do non-GPS plain old longwave and shortwave radio clocks - https://en.wikipedia.org/wiki/Radio_clock https://en.wikipedia.org/wiki/Radio_clock