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GPS or GPS + Glonass or GPS + Galileo and why?

I can choose to set satellite network to GPS or GPS + Glonass or GPS + Galileo.
These are United States, Russian and European navigation satellites.
What are the benefits and drawbacks of those choices. Better accuracy? Better battery life?
Why can't I choose GPS + Glonass + Galileo?

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Garmin-Matthew over 4 years ago +-3 verified

This link should answer your questions. (Changing the Satellite Setting) These settings will reduce battery life. However they will 'increased performance in challenging environments and faster GPS…
Krispie76 over 5 years ago +1

Actually only gps should do its job in case satellite reception is perfect. The combination with another system will improve accuracy when the signal gets weaker. Some people will claim that accuracy is…
robcmo over 5 years ago +1

Galileo will be most accurate, but is not fully in-place yet.
Accuracy expected <1 meter!

https://en.wikipedia.org/wiki/Satellite_navigation#Comparison_of_systems
George over 4 years ago in reply to robcmo +1

No, this is maximum theoretical accuracy. In practice, nobody I'm aware of has published any consistent evidence it is better than gps in real life, although it could still be. Theoretical accuracy isn…

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0 6705699 over 2 years ago in reply to 6848944

I had that problem since I started charging my Venu 2 with standard Samsung 1A charger. Then after since start charging my device with an Apple standard charger - same 1A the problems gone! Apple use a different technology for their chargers and it seems Garmin like it better.