A good GPS car navigation system can be a time saver, a money saver, and sometimes possibly even a car-and-people saver. I know that for some, they’re incredibly annoying at best and untrustworthy at worst. For me, though, a good GPS unit is great for driving around in unfamiliar territory. It lets me concentrate more on my immediate surroundings by saving me the trouble of mentally mapping out the big picture of where I’m trying to go — or worse, trying to flip through a Thomas Guide while driving.