xGPS: Turn-By-Turn Voice Navigation for iPhone [Cydia]
xGPS uses Google's map data and driving directions, adding a real-time navigation readout and a voice engine. You can also select a map area to download ahead of time, just in case you expect to lose your data connection during the drive. There is also a night mode for those who hate bright white screen shining at night.
Sounds like one more reason to jailbreak. Watch the video, how this nice app works:
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