Quote: (Originally Posted by
Paul Evans)

Sorry don't mean to hijack but why hasn't someone put a small LCD display to show the actual PO2 on a hud? Only the LCD would need to be housed I,d assume electronics to run it inn the head.
Please bear with me I,am new to this and trying to learn

I think the Prism has a small LCD on the mouthpiece, I seem to remember seeing one at DEMA one year, the problem with this is focusing, its not very comfortable to keep having to focus very close and then return to distance vision, it makes me feel sick after a while!! With an led hud there is no need to focus on it, it is visible in your periphery vision all the time.
Dave