As far as who I choose to obtain navigation data from I’m open. However, the Aerosoft web site mentions compatible with Mac OS 10.5 or higher, But… I just looked at Aerosoft’s Manual for “NavDataPro”. Looking at the manual leaves me a little uneasy, as it is laden with the Microsoft PC look. The installation even mentions allowing the software to be loaded in default location “C:\Aerosoft\”. That file system, as well as a “Control Panel” is non-existent on the Mac. I don't want to come off sounding like a Mac-snob, I've used both platforms, among others that have not withstood the test of time. I've been using the Mac since 1987, and enjoyed the reliability.