Iphone gps -Turn-By-Turn Voice Navigation by XGPS

Xwaves is planning to release the latest version of xGPS (v1.2) which will turn your iPhone into a True GPS device by bringing turn-by-turn voice navigation.
xGPS (v1.1.0-1) is already available via Cydia which provides real-time GPS navigation, but it does not have voice instructions.
xGPS v1.2 is expected to be released at the end of the month (and maybe as early as Feb 20) and you should be able to install it via Cydia on a jailbroken iPhone.

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iGPS360 external gps unit now available to order

The iGPS360. The little add-on module brings GPS to your jailbroken iPhone or iPod touch, and is now available for order. Only 1,000 will be available out of the gate, at $75 (plus shipping) a pop. Since we haven't seen one in the wild, it's hard to know how well these modules will work . lets wait and see .