Legality Issues is the same as Police and Fire Scanners.... Open airways....ATC is open airway because everyone (Pilots) need to know the published frequency in case of emergency....But like for other buttons Secure1 and 2 (Like We had in our Helicopters.) Those are Secret to Top Secret depending on mission, and need to know. And if you have that, then that is a different story. As far as scanner, they are different bandsa nd all, but if you get them in a different area, or working with a GCI it will be usable to have a scanner (normal handheld one.)