Hello, After 13.0 update + after charging the watch the altimeter changes the values with 2 or 3 meters - maybe is a barometer issue but this occurs only after the watch is charged.
I have big issues with altimeter since the fw 12. XX (11was ok). The issue is that mode Auto does not work in my opinion. Even when I am at the same altitude the altimeter has big changes due to the pressure changes (weather). But the error is only in one direction: the measure is always bigger than the real value and this deviation increases day by day. So for ex: I calibrate the alti and so the error is zero, after one day is about 20m, after 2days is 40 m and so on.