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Altitude WAY Off During Activity and RARELY Accurate

I've seen various discussions regarding altitude corrections and inaccuracies across multiple Garmin devices. However, I don't know if I've seen people complain about several hundred feet of difference like I am experiencing below, though I am certain I am not alone.

Here is a hike I did a week ago today. Without elevation corrections enabled, my Expedition was showing wild differences in my elevation:

Here is another, different, trek I just completed. I want to highlight specific spots where I actually paused the activity and recalibrated the altitude on the watch with GPS, getting an accurate reading. Very quickly, however, the problems persist.

Here is an overlay:

What the heck is going on here? This isn't even close!

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Garmin-Heath over 5 years ago +2 verified

AdamTKincaid and anyone, if you are experencing this issue, please reinstall TopoActive using Garmin Express on a computer.

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0 AdamTKincaid over 5 years ago in reply to Garmin-Heath

Thanks for the tips, nmyeti and Garmin-Heath. I did this and it seems to have made things A LOT better, though not 100% accurate. (Which I don't expect from any device.)

Here is a short hike I did today:

0 nmyeti over 5 years ago in reply to AdamTKincaid

That is much better and more like what you should expect out of a device with a barometric altimeter. Glad it is working now.

0 Bodya over 4 years ago in reply to Garmin-Heath

Hi, not exactly topicstarter issue, but probably related. On my fenix 6X Pro Solar I have Elevation Plot all the time absolutely flat for upcoming part of route. Only past part (what I actually did) displayed green and with hills reflected. Any idea how to fix?