A couple of years back, I invested good money in a top-of-the-line navigation GPS. While it still holds its own, for less than half of its cost, I now have a 320×240 color GPS in my car that’s just as accurate, faster to lock from cold or warm start, and includes a street map of the entire country. Oh, and it has navigation and real time routing. It works really well.
About the only downside is it’s something else to stick on the windshield and attract attention to my car. The one Sarah has is a little better for that, since it supports remote antenna mounting, though I’m pretty sure a helix GARMIN antenna next to my SIRIUS antenna isn’t going to be much less obvious to the savvy thief.