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I really like this. My only issue is that the prototype ignores single finger, which to me feels like it should be the most important control. The other issue with number of fingers based gestures is, well, people who are missing fingers. I also think using both the X & Y position could be really useful. Why not tune the radio by dragging up and down and adjust the volume by move right and left, or other combined gestures?

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I kinda feel like the default screen for this thing would be a map, so a single finger would just scroll the map around. And with one finger you can't find a diameter so there's no second option with wider spacing for a single finger.

I really like the idea of an always-on GPS that can intercept commands for other stuff (radio, HVAC, etc) and forward them to the appropriate app/microcontroller/hardware.

One possible explanation is that these are intended as additional controls and the single finger interaction is still reserved for a more button based approach.

That's how I imagined it too. Single finger would be reserved for getting back to a more conservative input mode.

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