For years now, I have used the normally excellent app, FR24. I find it both useful and entertaining.
For the last few months it has been regularly supplying wildly incorrect ALT readings from all over the place.
I originally reported to the FR24 people months ago, but nothing has changed.
A couple of days ago, I tried again, sending screenshots taken of different aircraft in different geographical locations, over a period of a few minutes.
FR24 replied by saying that the have never heard of this problem from anyone else and asked me to uninstall/reinstall the App.
This advice of course took me full circle as in my original correspondence, I explained that this had been my first course of action !
Has anyone else experienced anything similar.
I am using a fully updated Samsung A51.
Here is a sample screenshot from a selection of many !