Elevation gain/loss in courses largely overestimated

Hey, I found a work around that works with my watch and bike head unit. If you create your course in strava (or whatever else you are using) and then export as gpx (I think you can do tcx too) you can then copy it directly to your garmin without using the connect app. You need to connect your device to your computer and than look for a folder called "New Files" - just copy your file here and it will be added as a course - with the correct elevation! I also found this works great with workouts too (I use Final Surge which enables much better workout building than available in the connect app).

Hope it works for you too! I have done a good few courses this way and climb pro works just great! :)

Wow, I came here to the forum as I encountered this problem after using the new Strava / Kommot Courses Sync function. Read all about it at DCR: https://www.dcrainmaker.com/2020/05/garmin-launches-strava-komoot-route-sync-works-on-devices-a-decade-old.html

If I use the Komoot Connect IQ App the elevation details are completely fine. The same courses appear via the new sync in connect (correctly on the app) and if I open them this way in the 945 or also edge 520, elevation is way off. 

has anyone heard of a fix yet?

Most probably Garmin is running their bad elevation data to the courses that they sync and add to Garmin Connect Web.

I wouldn't hold my breath that Garmin is going to make any changes :( 

maybe if there's some bad press/ reviews e.g. by DCR concerning the new sync feature, this 'old' problem gets tackled as well.

Let's hope so. At least PacePro wasn't enough to get this fixed :( 

Meanwhile for the courses part just download the .GPX which has good data and put it to the watch NEWFILES folder and it will add it without Garmin "fixing" the elevation, unfortunately no PacePro, but at least course with proper data.

I actually use the Komoot connect iq app and that works, never has problems

The other workaround is to use the IQ App Strava Routes. 
Even the newly introduced easy sync with Strava

https://www.dcrainmaker.com/2020/05/garmin-launches-strava-komoot-route-sync-works-on-devices-a-decade-old.html

still goes through Connect and messes up all the data. 

So the only two solutions are Komoot and Strava Routes. 
Frankly, it is embarrassing that Garmin cannot get the elevation data correct.

nope, the problem we are discussing here regards Courses and not Activities. The activities record elevation data through the barometric altimeter, and they are fine. If I want to plan a bike ride and use Courses to have the track on my watch, the elevation data is totally wrong (largely overestimated)

i totally agree. and this is a global garmin problem, not just one device! i have it on forerunner 945 and the older edge 520. if you look at the elevation profiles you can even SEE many many little spikes