They are operational and very compatible with GPS.
Modern devices have them all, the iPhone 13 for examples combines satellite data from GPS, BeiDou, GLONASS & Galileo.
In practice, you get a "super-GPS", with way more satellites (120 vs GPS' 35) and great coverage. Potential accuracy can be in the cm's, it is all about software optimization.
Modern devices have them all, the iPhone 13 for examples combines satellite data from GPS, BeiDou, GLONASS & Galileo.
In practice, you get a "super-GPS", with way more satellites (120 vs GPS' 35) and great coverage. Potential accuracy can be in the cm's, it is all about software optimization.
https://www.nature.com/articles/srep08328