I use the app on my samsung s5 mini smartphone. However, I noticed that the altimeter shows 45m more than the correct altitude. What am I supposed to do to correct the measurement?
In my case it helped a lot to reset the phone and also to keep it always with a clear sight of the sky (not in the bottom of my backpack or in my pocket for instance). In my MTB I wear it on the handlebar and so far so good. Hope it helps!