Again, how many joggers or cyclists are interested in spot-data during a run? EDIT: to clarify: it's not just "hands busy, can't type". It's "hands busy, can'

Again, how many joggers or cyclists are interested in spot-data during a run? EDIT: to clarify: it's not just "hands busy, can't type". It's "hands busy, can't type, but would benefit from concurrent computing enough to justify the cost of a dedicated face-computer" And in-car HUDs have been available for years and people don't seem to care. Putting GPS instructions up there might get more attention [1], but at the point that Glass is merely beaming data to a remote display, it loses any advantages of its form factor. The API could be re-used but good luck getting car manufacturers to decide on a standard for such things, let alone a standard from an outside party. [1] though suffering from the same problem of "browsing a street full of business": how often do most people really need GPS, that marginally-improved GPS access is worth a non-trivial cost?