It wouldn't matter if you moved your head to the left by two inches, or if you had the person in the passenger seat telling you where to turn. Thanks to holography, the beam is projected out to infinity, paralax-free. The best example of this is on weapon sights, with the relatively new EOTech holographic sights you can move your head around, but so long as you are able to see through the sight, the reticle will remain on the target (the reticle will appear to move to compensate for your own motion).
So long as that is the method they go with, all should be fine and dandy with concern to movement of the driver within the vehicle, and the technology is pretty cheap so far as I know; they've been able to scale it down to fit on a rifle, and it only costs around $500.
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It wouldn't matter if you moved your head to the left by two inches, or if you had the person in the passenger seat telling you where to turn. Thanks to holography, the beam is projected out to infinity, paralax-free. The best example of this is on weapon sights, with the relatively new EOTech holographic sights you can move your head around, but so long as you are able to see through the sight, the reticle will remain on the target (the reticle will appear to move to compensate for your own motion).
So long as that is the method they go with, all should be fine and dandy with concern to movement of the driver within the vehicle, and the technology is pretty cheap so far as I know; they've been able to scale it down to fit on a rifle, and it only costs around $500.