SATNAV(uppercase)? - idk.

wiki here tells us about
BeiDou ( China) \ Galileo (EU) \ GLONASS (Russia ) \ GPS (United States ) \ NAVIC (India ) \ QZSS (Japan )
but mentions satnav(lower case) as a generic name.

https://en.m.wikipedia.org/wiki/Satellite_navigation?
... A satellite navigation system with global coverage may be termed a?global navigation satellite system?(GNSS).
As of December 2016, only the?United States'?Global Positioning System?(GPS),?Russia's?GLONASS?and the?European Union's?Galileo?are global operational GNSSs.
The European Union's Galileo GNSS is scheduled to be fully operational by 2020.
?China?is in the process of expanding its regional?BeiDou Navigation Satellite System?into the global?BeiDou-2 GNSS?by 2020.
?India,?France?and?Japan?are in the process of developing regional navigation and augmentation systems as well. ...

There are links there so you might find a description of systems which have been turned off.