Welcome from a fellow pilot. Do you have a glass panelled aircraft? If so, do you have problems reading the display there? I use my iPad and GPS (Garmin 496) in my C172 without any problems, though I have sunglasses which allow me to look at the instrument panel and GPS (i.e. looking down slightly) without having to look through the lens of the glasses. When I look up and out of the aircraft then I am looking through the glasses.
What sunglasses do you use? Ray Ban?
Of course, I fly in Scotland, where it's not that often too sunny!!
Tim