Just to follow up on Gordon's (flyitfast) problem with the app. He has reported to me that the app works fine on his iPhone 5 after he upgraded the iOS to 9.2.
I still don't know exactly what the problem was, but I suspect that he was running 9.0 at the time he was having problems. That iOS version was quite buggy and Apple made lots of corrections between 9.0 and 9.1.
So far, not a single bug has been reported with the app (that's not to say that it is 100% bug free, but at least none have yet been reported).
On the other hand, not a single improvement has yet been suggested either. Does it really do everything you could possibly want from such an app?? No promises, but all suggestions will be considered.
Eat pecans - 10,000,000 squirrels can't be wrong.