I refuse to purchase a GPS system, but did break down and install Google Maps on my phone. It gives me an estimated position based on cell tower triangulation, and I've never had a problem finding where I was in that "estimated location" radius fairly quickly, and the maps work just fine for me. The one time I used a GPS (in a rental car), it got me lost. Screw that, LOL.
But I do carry a 50 state atlas in my car, just for backup. And when I'm road tripping to a place I've never been to (a few years ago that would be clubs for concerts, now it's tracks for NASCAR) I print out a fairly detailed map of the area surrounding my destination. A dozen city blocks or so, at least. Gives me easy ways to scout out an alternate route to the interstate to head back home.

Never leave home without it!!