My GPSMAP 64ST defaults to GPS plus GLONASS. If I wished to it is easy to set it to GPS only. RTM! When I did a very quick check with GPS plus GLONASS I had 13 satellites while GPS had 9.
My DriveSmart uses Galileo and GPS so no issues there. If there were an issue I couldn't find a way to turn Galileo off.
I think you are fine without GLONASS and although Garmin makes wearables that use it (and Galileo) I don’t think it can be disabled on an automotive device. It sounds like you’ve already accessed the Satellite Information Screen, which yields accuracy which will be quite good with about 5 satellites or more.
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