Maps (6.9 MB), an excellent mobile mapping app by Google to get directions to go from one place to another, search for any business or place to find more info, or see where your friends are right now on the map and so on.
Waze social GPS maps & traffic (18 MB), a voice-guided navigation app complete with live maps, turn-by-turn directions, automatic re-routing as conditions on the road change, and community generated real-time traffic and road alerts including accidents, hazards, police traps and more.