Earlier quoted context omitted.
GLONASS, But that's splitting hairs
Although the Russian air force planes with a Garmin taped to the control panel may indicate otherwise on that technology....
GPS and GLONASS use different frequencies and redundant signaling systems is common in aviation.
And Garmin actually works with both for a more accurate location:
https://www.getaway.co.za/gear-reviews/news/garmin-russian-s...