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elevation graph is completely wrong

9009492
2 months ago

the last few weeks probably after a firmware update the elevation graphs have gone completely mad..

this is an elevation graph with uncorrected data from today's ride: 

this is the same ride after applying corrections 

anyone else having the same issue.. the graph doesn't seem to be from the same ride. is my barometric sensor broken is it the 24.x software update? i have factory reset the edge but it remains the same... maybe i should rollback the firmware? is that even possible? 

  • 0 2 months ago

    Preaching to the choir. In the beta forum that was criticised from the beginning of 24.xx. Gradient doesn't use the altimeter anymore, it's now GPS based. Actual altitude is mostly completely wrong, too. - You can downgrade to an older firmware but it won't help, it's been tried. Garmin barely ever reacts to beta posts/questions. 

  • 0 2 months ago in reply to OliverS73
    OliverS73 said:
    Gradient doesn't use the altimeter anymore, it's now GPS based.

    I have seen that stated a few times, is that an assumption or quoting a source? By “GPS” do you mean a satellite based altitude or elevation data from a course, if any? It would make zero sense to base it on GPS satellite altitude as the measurement would always have a large error range and variability? GPLAMA had a video showing a 1040, 1050 and Wahoo something side by side on his standard grade / elevation test course and they largely (within a few seconds) agreed.

  • 0 2 months ago in reply to L.Rouge

    I've read about in the comments to DC Rainmaker's review of the 1050. Then I decided to perform my own test. Soon as you switch GPS completely off, gradient remains at zero and will never change. - I know it doesn't make much sense, esp. since Garmin states in the manual GPS altitude could differ as much as 300m per measurement.

  • 0 2 months ago in reply to OliverS73

    If you turn off GPS and do not use a speedsensor, the gradient must be zero, because there is no distance measurment anymore. 

    Btw - my 1040 shows correct elevation and gradient.

    …and - off topic - here are pictures of my Edge 1050 (1040 and 1050 have the same software regarding gradient…)


  • 0 2 months ago in reply to mcinner1

    That's a no-brainer. Of course I used a speed sensor, the Garmin Speed 2.

  • 0 2 months ago in reply to OliverS73

    Just came back from my todays tour and have checked gradient without GPS (I have a speedsensor, too) - and you‘re right! No gradient without GPS.

    Nevertheless, I doubt that the barometer chip is not used for the gradient calculation, because the gradient display (at least on my Edge) works very accurately.