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Elevation going downhill problems

neldiogo
over 6 years ago
I was having issues with elevation starting to decline just after starting a running activity even after de 30 seconds reset. I thought it might having something to do with sweat getting into sensor but after several tests I found it has nothing to do with with.

So I started to test with GPS settings. I was using GPS + Galileo because I saw an increased accuracy vs GPS only. But after some tests I found that when running with GPS only I don't get the downhill profile I was getting with Galileo.
  • 0 over 6 years ago
    Interesting observation. Have the same settings (GPS + Galileo). And same problems with lowering. Will test GPS only today and report.
  • 0 over 6 years ago
    Tried this today. I switched over to GPS only (was on GPS + Galileo) and had an elevation drop of over 120 feet in the first, and relatively flat mile. But it is strange...I looked back through all my runs since January, and they all start with an elevation drop of about 100 feet, regardless of the actual terrain.
  • 0 over 6 years ago
    Tried this today. I switched over to GPS only (was on GPS + Galileo) and had an elevation drop of over 120 feet in the first, and relatively flat mile. But it is strange...I looked back through all my runs since January, and they all start with an elevation drop of about 100 feet, regardless of the actual terrain.


    Did you wait 30 seconds before starting ? This way the GPS refreshes the elevation.
  • 0 over 6 years ago
    ...But after some tests I found that when running with GPS only I don't get the downhill profile I was getting with Galileo.


    Sorry. Can not confirm that. I was 2x biking and with GPS only happened the same as with GPS + Gallileo - after about 10 minutes. starts descending and in another 20 min. i land 120 m. under real height.
    @neldiogo- It doesn't matter, the lowering starts much later.
  • 0 over 6 years ago
    Did you wait 30 seconds before starting ? This way the GPS refreshes the elevation.


    Yes, I did.

    I think the problem is that the elevation calculation uses the temperature sensor to adjust elevation, but somehow overcompensates. As it warms up (due to increased body temp), elevation decreases.