The Google Maps app for Android includes an “offline†feature that lets you store a map on your phone for those times when your data signal is weak or nonexistent.
To save an open map on the phone, press the Menu button and choose “Make available offline.†Select the area of the map you want to save by pinching or zooming to it, then press Done. You can find your saved map in Google Maps by selecting My Places and then Offline.
Google’s site has more information and links to illustrated instructions.
