Can't believe no one has mentioned this yet...
If GPS/maps/places is the only thing you need a smartphone for, a Garmin GPS will run you $50-maybe 200, one time, no data plan. They come with lifetime maps, the higher-end ones have traffic (there are some even higher end ones in the 300-400 range, but I think those just tend to have larger screens, etc?). If GPS+text+call is all you need, this is your most cost-efficient route.
Obviously, a smartphone also allows you to also search the web for information, check email, read MMM forums, waste time playing games, and so forth. My personal opinion, having chosen a ~1yr old model for my first smartphone that I have just upgraded 3 years later...and this is not as badass as some, I know...If you plan to keep it a while, just get a modern phone, because while it might work fine/great when you first get it, but you start losing functionality after 2 years or so, and become frustrating. Some apps don't install, others don't run well. If we're talking about a used model of that age, chances are the battery will not hold charge as well, the electronics will wear out and lose efficiency (mine heated up like crazy sometimes, which damaged the screen--I didn't realize what the problem was until there was a half-inch black blob on it). I know many on here won't agree, but that has been my experience.