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Garmin Connect Courses elevation gain grossly overestimated.

gazzasrides
over 4 years ago

When creating a course on Garmin Connect the elevation gain is grossly overestimated. I can download the GPX and upload to other programs (e.g. strava) and the courses match reality. It is very large over estimate of 30-40% and obviously wrong by inspecting the plot. Anyone else seen this and is there a fix?

Note same file in Strava is approx 3200m elevation gain.

  • 0 over 3 years ago in reply to trux

    as they are imported, the show the correct value in GC still - the problem starts opening them on the watch, after being sent there.

  • 0 over 3 years ago in reply to DanielM
    DanielM said:
    as they are imported, the show the correct value in GC still - the problem starts opening them on the watch, after being sent there.

    OK, so isn't rather a problem of the firmware of the watch? What model do you use? What is the difference in Elevation Gain between Garmin Connect and the device? Can you give couple of examples (like "46m in GC » 100m on the device", or whatever else you see) 

  • 0 over 3 years ago in reply to trux

    No its not. it has happened on my edge as well and - as posted above to many people on many devices.

    if i use the workaround via komoot connect iq app or strava app or posting the course to new files this does not happen. see the first screenshot on DCR. on is imported via connect, the other via connect iq app on the watch. same with the edge.

  • 0 over 3 years ago in reply to trux

    exactly the same course/ gps source just two ways of getting it to the watch (units all metric)

    media.dcrainmaker.com/.../3562253-16003x1200.jpg

  • 0 over 3 years ago in reply to DanielM

    And if you create the same course in Garmin Connect, does it overestimate the elevation gain in the same way already in GC? That's at least what the opening post tells. Or does the number in Garmin Connect also differ from the one on the device?

  • 0 over 3 years ago in reply to trux

    i guess so. this i will check out later, if i have some more time. try to create the same course on two different platforms and see. thanks for that idea.

  • 0 over 3 years ago in reply to DanielM

    but maybe or can shed some more light on this - they were very active concerning this question as well. 

  • 0 over 3 years ago in reply to DanielM

    To me it has been underestimates. And to me it just seems Garmin Connect does their elevation fix for the Courses always and you can't disable it. And how it will look depends on the quality of the DEM data for that region.

    You can try to take GPX which has good elevation data and create course to Garmin Connect Web with it and look at the elevation data. If it's good in that region the data is good.

    For example GPX track for one Trail Running event which is run in route that I've planned.
    https://www.solvallatrail.fi/@Bin/261699/SolvallaTrail10k-2019-v2.gpx 

    GPS Vizualizer makes elevation data of it:



    Then that GPX is imported to Garmin Connect:
    https://connect.garmin.com/modern/course/27537352

    Look at the differences of the elevation data. And here's one run on the route:
    https://connect.garmin.com/modern/activity/2774198384

    And if you compare that GPX visualizer data with the real activity it more realistic, and if you look at the real activity and activate elevation correction you notice that it will become as flat as the course is.

    Does this make you understand what the problem is, trux? 

  • 0 over 3 years ago in reply to DanielM

    Hi , here is an example.
    Course created on Strava: it matches correctly the elevation gain as measured by barometric altimeter in an activity and the one estimate by any other route planning website except Garmin Connect:

    https://www.strava.com/routes/24776235

    Same course on Garmin Connect (the result is identical if I create the course by hand or import the course GPX)

    https://connect.garmin.com/modern/course/34131306

    As you can see it includes almost 300 m of downhill which are simply not there on that road. 

    If I upload an activity, recorded with my Garmin device with barometric altimeter (FR 945), the elevation gain is correct, so the problem is with courses and it breaks ClimbPro  (unless I download the GPX file to the device via USB  - Strava routes IQ App - Komoot IQ App but in this case I don't get turn by turn navigation) 

    This has happened to me with every single course I have created in the last year or so. 

    As I said elsewhere it is honestly embarrassing for Garmin that they haven't been able to solve this problem it in the last year at least. 

    Thank you and for keeping the discussion alive.