Just wondering if anyone out there travels a lot and has a portable GPS unit for their car and if so which one and do you like it. My daughter is going to become a traveling nurse and go all over the country on 13 week assignments..the problem is she is terrible with directions. I am making myself sick with worry over her and decided maybe this is the way for her to go. We know NOTHING about these kinds of things so if you do could you enlighten us as to what to look for and what kinds of accessories they need. Thanks for your help!