An other major annoying Bug, unless I have missed some configuration features on 820 (but not on 810), is the fact that when following an uploaded course, for a climb (Ventoux to not mention), since strava stared segment is not reliable, 820 will give you "time to next" hairpin even if no crossroad... "Time to dest" was a (another) joke. I would like the option of no calculation, no prompt... just give me what estimated time remain to the end of course!
really thinking seriously putting my edge 810 together with 820 on my handlebars. only garmin IQ save 820 . how damned can this be possible :-/ and now 830 out for sell....:-/