Hello,
I'm using my instinct for a while now and one thing really bothers me. I calibrate the altimeter before I go on a bike-ride, usually by giving the altitude.
I noticed some things after this ride connect.garmin.com/.../3901930141:
- the tracked elevation especially in an about 90m deep tunnel (around 26.3km; the tunnel has of course no GPS reception) is about 0
- the altitude is obviously not correct on e.g. bridges (around 3.59km, the bridge is one gentle slope up and one down, not two)
- somehow the watch seems able to track negative altitudes but how it gets to that conclusion is really beyond me (-30m at about 26km)
- there was no thunderstorm, freaky weather-shift or the like on that day
My settings for that ride: Auto-Cal is off, Watch-Mode is auto. In that regard I really miss my Suunto (Traverse Alpha) which tracked it way more plausible: http://www.movescount.com/moves/move161985352. And where one could also configure (per activity) that any change to air-pressure is more likely caused by altitude-change (hiking in the mountains) or by a pending weather-change (sea-kayaking).
Any ideas how to fix this?