There has to be some way to switch between the radio functions and the Navi app (without having to exit the GPS app, which doesn't help anyway). I would reach out to the manufacturer (if possible) or maybe even the vendor). Typically, one of the hardware buttons perform this switch between modes. I'm honestly out of ideas at this point without having the unit in front of me to mess with...

Did the radio come with a manual? If so, is there any info in there about how to switch between radio/navi modes?

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