Ok, so what if the navi app is still running and you press the Navi button? I know that you said it boots the Navi app after you've already exited the app, but what happens when you press it while the Navi app is still running?
You should *not* ever have to actually exit the Navi app on this unit. If there is no way to swtich between radio and navigation, something is wrong...
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