I'm honestly not 100% sure about the radio in question, but the radio that I have a lot of experience with (Rosen GM1010) sure seems to have 2 completely separate "instances" of the OS. For example, if I boot into WinCE on the "GPS side" (uses external SD card for GPS app, so I can replace GPS app binary with a file explorer and then get into WinCE), I cannot see any of the non-GPS related files or filesystems. The GPS and radio "sides" know nothing about each other and can't communicate with each other in any way whatsoever (you don't even hear GPS instructions unless you are in the GPS "mode". I believe the GPS-side OS is embedded on a '"daughter-card", along with the GPS radio and SD card interface (in fact the GPS SD card slot is wired directly to the GPS daughter card instead of the radio motherboard like the "media" SD slot). Also, if I bright up a task manager on the GPS "side", there are no other processes running - just the GPS app.

On the other hand, a newer Rosen model (GM1210) runs WinCE 6 and the GPS app and the rest of the radio functions are all running in a single OS (I can boot into WinCE and see both the GPS and non-GPS files. It's definitely only a single instance of the OS. I can see other processes from a task manager, etc...

So I think it depends on the exact radio. With the way his GPS exit screen stays there when he exits, it almost sounds like it's completely separate like the Rosen 1010... Just a guess though.

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