Interessante classificação dos HMS/HMD (Helmet Mounted Sight /Display), postado no Key Publishing Ltd Aviation Forums (http://forum.keypublishing.co.uk/showthread.php?t=72842):
MiG-29/Su-27 etc.: FIRST GENERATION - basically a simple cueing system that tells the missile seeker where to look.
Jaguar HMSS, JHMCS: SECOND GENERATION - Still monocular, but with expanded symbology, allowing the helmet to tell the pilot where to look, as well as allowing the pilot to tell missile seekers (or the LDP) where to look or to update the nav kit using the helmet sightline.
Typhoon (Striker)/Gripen (Cobra): THIRD GENERATION - Binocular, with full raster and cursive (virtual HUD) symbology, night vision, video imagery from sensors, often with laser eye protection, etc. Lower latency, higher accuracy head tracking, etc.
F-35: Will be FOURTH GENERATION if it actually delivers the step change in reliability required to be a full replacement for a HUD. This is a hell of a challenge for an item plugged in and unplugged every flight. LCD-based (not LED, not CRT), with wider FoV, sensor fused display
Helmet Mounted Sight /Display
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