Hi all! I'm hoping for some good old advice. I'm in the market for a GPS unit or something. It wouldn't be primarily for a car, as I don't have a car, but more for not getting lost when I go on my day trips into various cities. It looks like there are some good portable ones that people use their cars, but I don't know if the battery life is adequate. The handheld ones don't get very good ratings, but the battery life is incredible. I don't know how well they do in cities, though. Finally, I have AT&T (but don't have an iPhone) so the other option is their Navigation service. I'm wondering how the day-pass works and how good their maps, etc are. If you have any tips or opinions, I'd love to hear 'em!