I can think of two markets that this may do well in: motorcyclists and runners. Motorcycle HUDs have existed for quite some time now, but more competition espe

I can think of two markets that this may do well in: motorcyclists and runners. Motorcycle HUDs have existed for quite some time now, but more competition especially from someone as big as Google will inject some much needed innovation. I can also see this being popular with running enthusiasts. During my races I wear a paper band around my wrist with my ideal times for each mile, and then have my GPS watch set to show instantaneous pace. A race involves constantly looking between watch, paper printout and your surroundings. If I had a HUD, I might even enjoy the race a bit :) (that was slightly sarcastic)