[manarth]

I tried Recon's skiing goggles and found their HUD awful.

A true HUD doesn't need you to look away, or refocus your eyes. The Recon screen's position (near the bottom of the goggles) means you have to almost go cross-eyed to read it, and focus on short-distance…absolutely not what you want when you're skiing!

Their handbook says it should only be looked at when stationary.

BMW's HUD looks like the way forward : a sunken dash-mounted display, which projects the data onto the windscreen. In other words a true HUD: directly in your line of sight, no need to refocus your eyes.

I'd be interested to understand if there's some technical limitation preventing this approach with goggles/helmets.