Does anyone have one? I wonder how useful one would be for a dyslexic young adult. As it is, I am her GPS. When she gets lost, she calls me, I look on the map and direct her. She plans to take a road trip alone in December about 2-3 hours north of us and of course, I will worry. Are GPS systems expensive and worthwhile? How do they operate? Do you pay monthly to a company? Thanks.