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To start - the app is great ! its not perfect, but if I had to give up this or the "real" one ( the garmin ), Id give up the garmin. This is easier to use and they keep making it better.
That being said, on the last update they added the ability to tune the VOR and HSI one degree at a time ( very useful when doing simulated approaches in bumpy conditions ( are there any other kind ? ). Unfortunately, on that update my mileage scale at the top of the map screen seemed to be in Greek or something ( letters where there used to be numbers ) - something similar with the message box that pops up when setting the VOR/HSI/ADF degrees ). Im quite disappointed that this latest version didnt fix this bug.........

Al & Jenny about Air Navigation Pro, v5.1.1