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Yes, the GPS navigation would require a touchscreen (or a keyboard such as the PS2 USB chatpad things that people have been talking about). I'm less worried about the navigation because I will enter the destination before I start driving. I want the media playback to be smooth enough to use while driving, which means not being forced to keep my eyes on the touchscreen, which would be distracting while driving.
I guess I will use a touchscreen + rotary encoder joystick, but I would like a way of scrolling through songs and being able to easily hit play / pause / ff / rew without looking at the screen.
Thanks for the RR suggestion, I will try that out. Any others?
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