My wife and I are regular users of Cachly.
She has an iPhone5S and I have a iPhone6. Both are running current IOS and current Cachly versions.
We've both noticed that during an outing of several hours, cachly will ask us to calibrate our compass'.
I've searched the forums, but haven't been able to find anything relevant to this topic.
Was wondering if anyone had any insight.
Thanks,
SB