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gps+glonass or gps+galileo

Dani
over 3 years ago

I would like to know and have confirmation from Garmin, is it useful to select gps+glonass or gps+galileo?

I mean does it improve accuracy on anything? because I have had two forerunner945 and I have not seen improvement in any test.

In my last race it even deviated 1km (gps+glonass). I think it's placebo effect.

Thanks

  • 0 over 3 years ago

    this is a VERY complicated question to answer for your precise requirements (which you haven't stated)

    Generally, though Garmin has now optimised GPS+GLONASS quite well so that should be the best compromise most of the time.

    Until relatively recently GPS-only was the best and, as other commenters say, that saves battery too.

    It depends on what usage you want them for...GPS-only is fine for a pretty picture of where you've been and you will likely find that all of the combinations of constellations are mostly poor at showing correct pace and distance unless you are in open skies.

    other commenters talk about location making a difference and this can be true. satellites move around and 30 minutes can and does make a difference (the ios app GPS Plan shows you this exactly for your location and time). IIRC high latitudes favour GPS+GLONASS in the northern hemisphere

  • 0 over 3 years ago

    Yes, the additional satellites will almost always improve the signal. Specifically, you will decrease PDOP, HDOP, and TDOP.

    There are apps that you can track what GNSS systems are available for a day and time. GNSS View and GPS Plan are two free apps available on the Apple App Store.

    In my location in the US, there are dense trees and lots of hills that can obscure satellites. It is not uncommon to only be able to "see" a handful at a time. Choosing between Gallileo and Glonass should come down to which are more prevalent at the time you need them.