I remember the hard task of getting night screens dimmer in the early days PC navigation programs. I was beta testing for one of the (now) big guys out of Seattle. Finally, I asked if they had a closet with no windows, he answered yes and I said go in with a laptop, close the door wait 10 minutes then open it up. Ah came the answer now I understand. Still took a few more releases to get full red scale, not just the chart frame. That was back in the floppy disk days. An early adopter I was. So were a lot of Pilots. I think the Oakland Bridge incident had a lot to do with that.