I have had this huge spot on Nav screen for a few months now. Does anyone know what causes this? Is it due to direct sunlight? The X is in the garage when at home, but parked in the sun while at work. I've been trying to give it some shade by using a windshield screen for the past couple of months, but that doesn't seem to have made much of a difference.

I'd really like to know if it can be fixed without costing me an arm and a leg? She is a 2002 model.

Please help.