After calibrating the barometer the trending arrow is pointing down 15min after every altimeter calibration - fēnix 5 Plus series - Wearables - Garmin Forums
Garmin fenix 5X Sapphire GPS Watch | REI Co-op
Support: Altimeter Calibration on a Garmin fēnix® 5 - YouTube
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Altimeter problem after upgrade to 15.20 firmware - fēnix 5 Plus series - Wearables - Garmin Forums