GPS/Glonass satellites are (by simplification) only orbital atomic clocks with a radio transmitter.
Many things use gps time especially cell towers to sync radio cycles
The link at the bottom goes to the Russian order page.
Re:Bringing Nixie tubes back to life
by guard-of-terra on Thursday August 18, 2016 @08:12AM
(#12311848)
Told him that, maybe he'll fix.
https://aivelectronics.ru/aivnixie_eng/
I did not know that you can get time from GPS/Glonass before that.