2011 Elantra with Nav Package
 

I find that on bright, sunny days there is so much glare on the nav screen that it is unreadable. Then, if I turn onto a shady street, the screen is clear as can be. Hyundai tells me they do not have a sunshade-type device that would solve this problem. I'm generally alone in the car and this glare makes it difficult to read anything on the screen. However, if there is a person in the passenger seat, they can read the screen clearly. Has anyone else noticed this? And has anyone else found a makeshift solution? Thank you for your replies.