At certain times of the year, my 7" screen on the head unit was hard to read, even at full brightness, due to sun glare on the screen of my Gen 3. I fashioned a visor out of the black plastic that is used in report covers. Small tabs fit into gaps in the molding around the edges. It worked quite well until I sold it. The problem was solved on my Gen 5. The screen is vertical, and thus not susceptible to screen glare.