-Stress hrv always displays 1
-Strange segments that sometimes crashes the watch when you try to delete
-Same bug on resume stats after ending a mountain bike activity
-Same gps bad accuracy
-Useless barometer. Now I'm at 1000m and it display 1019.8, more than yesterday morning that I was at 35.
The barometers on the tablet and phone, display 904
Also possible you do not understand how it works. I'm saying this based on the limited information you provided and some assumptions (as it is not completely clear what numbers your are using for what measurements) - apologize if these assumptions are not correct. Firstly, there will always be drift over time which is why you would need to calibrate to a known altitude (way back as a pilot we would calibrate about every 15 minutes). This is normal and, yes, some ABC watches do it better under some circumstances and likely worse under others - I'm leaving that aside but read this if you want http://forums.watchuseek.com/f374/altitude-barometric-pressure-abc-watches-explained-266991.html .
The Barometric pressure shown in the standard widget is adjusted to sea level (mean sea level pressure) based on the current altitude - whether this value is correct or not. This is why, if you calibrate using a different altitude the pressure will change while clearly the current absolute pressure does not. There are widgets that will show you the current absolute pressure which is what I suspect your phone and tablet are showing. Why do I suspect this? Go to a calculator like https://www.mide.com/pages/air-pressure-at-altitude-calculator and use, as an example, the "Calculate Air Pressure at Altitude" calculator. Pressure at sea level is 101980, temp at 15C and altitude at 1000m as you provided. the resulting air pressure at altitude = 90455 pa - what your tablet and phone report.
The watch needs to figure out if pressure changes are based on weather changes or the watch changing altitude. This will drift over time (and yes, sometimes what seems much too quickly). On the other hand, using the barometer to measure altitude changes during an activity is generally much more accurate than GPS. If you are starting at an incorrectly calibrated altitude, then the raw numbers will be wrong but the elevation profile (climb and descent values) will be much better. However, even during an activity, changes in weather (thus air pressure) can impact the accuracy if they are fast enough.
The altimeter is affected by whether or not you are moving, unless you manually lock the watch to altimeter mode.
The fenix 5 watches continually monitor barometric pressure to determine which of these modes is most appropriate at any given time. When the rate of change in pressure is significant, it indicates movement and therefore the changes in pressure indicate elevation change. The watch will go into the altimeter mode allowing the altitude to change and locking the barometric pressure.
When the rate of change in pressure is not significant, it indicates no movement and therefore pressure changes are due to weather. The watch will go into the barometer mode allowing the pressure reading to change and locking the altitude.
It is possible to manually lock the watch into the Altimeter mode if your activity involves changes in elevation or lock it into the Barometer mode if your activity is in a relatively flat area. The Barometer mode is also useful if you are more interested in your watch notifying you of impending weather changes instead of elevation changes.
This makes me wonder about standing in the wind - would the watch think you're moving and adjust the altitude accordingly? Especially since the automatic calibration by GPS is done only at the start of the activity?
