HUD, heads up display. That is not what I am talking about. What I think will eventually come about is a mask which has an LCD screen istead of a pane of glass. The sonar emitters will either be on each side or remote mounted or even one of them might be on a goodman handle. The screen will have corrective diopters to allow clear vision. The sonar image will be much like the side scan image on my boat's sonar screen. It will present a picture, an image (proabably not color at first) that would present the underwater world virtually on the screen. Turning the unit off would result in "blindness" as the screen would be opaque just as the flat panel TV I am watching now. Squeezing the trigger on the goodman handle would inset in the main screen an image from that unit. Just as know you scan an area with your light. There could even be a zoom control from 1X to 3X etc. It would use a HUD to display depth, time, tank pressure, battery status, regulator "system" status etc. N