Wired has a trick for downloading Google Maps to use offline. I haven’t tried this.

TO ACCESS ONE of Google Maps’ best hidden features, you have to know the magic word. Well, it’s a phrase, really, and that phrase is: “OK Maps.” Enter this phrase into the Google Maps app and the portion of the map that’s currently visible on your screen will be saved directly to your device. Once saved, you can access that map even without a data connection.