Why can't one determine the slope as a percentage of incline in the "elevation" chart at any given point?
I think it's because Garmin just didn't bother to add that feature.
You could try this 3rd-party Connect IQ data field which can display your % Grade and write it to the activity FIT file to be displayed on Garmin Connect. I haven't tried it, but I think it might do what you want:
Maybe this video will help:
By the way, it seems like you may have downvoted your own comment, maybe in an attempt to undo an accidental upvote. The way to undo an upvote/downvote is to press the same button again.
If you want Garmin to add this feature natively, you can submit an idea here:
Thank you Sir, I'll give that a try.
Being closer to 80 than 70 I still prefer step by step written how-to's.
That's probably also the reason I find some of the functions in this forum less than intuitive, but it is what it is. ;)
And setting up/changing anything on my Vivoactive HR happens in Garmin Express,