Planes have inertial measurement units which are the primary source. GPS or GNSS are just backups. You can switch these off with zero consequence during the f

Planes have inertial measurement units which are the primary source. GPS or GNSS are just backups. You can switch these off with zero consequence during the flight. It may cause your satellite TV and internet to stop working but no critical systems will be impacted. Russian airplanes are commercially purchased from the same sources as the rest of the world and are generally outfitted with identical equipment. The impacts to flights has to do with certain types of GPS coordinated instrument approaches for landings. Most of these runways have alternative approach strategies that can be used during jamming or other unavailability.