Here’s a review of them from The Verge.

…you’ll be able to see where you are, how far and fast you’ve traveled, the outside temperature, and more. You can also see how high and far you jump, so you can figure out if your epic fifty foot jump really was as cool as it felt…

With all the geeky/nerdy people around Seattle (myself included , someone must have these already.

Who’s tried them and what do you think?

Or there are the Zeal Optics Zeal Z3 Gps Goggles: