I’ve had my Forerunner 970 for about a week, and ever since I used it for a pool swim, the altimeter has been acting up. It keeps jumping between 15m and 21m (49ft and 69ft) without any clear reason. In the screenshot, you can see how it shifted over the past 4 hours even though I haven’t left my apartment.
Has anyone else run into this? I tried recalibrating with GPS (it should read around 15m), but it always drifts back up over 20m. Is this kind of fluctuation normal for the FR970 altimeter, or does it sound like a defect?
Should I just keep using it, try different fixes, or reach out to Garmin support for a warranty replacement?
