Most high performance modern GPS devices are able to receive signals from the 4 major Satellite navigation providers.
They are the orignal "GPS" owned by the US, GLONASS owned by Russia, Galileo owned by Europe and Beidou owned by China.
They are all similarly accurate. The biggest gains in accuracy come from using dual frequencies from the same provider.
This is why the Garmin 255 is the watch of choice, it is the cheapest watch that can simultaneously use multiple systems and dual frequencies.