The different versions of XRoad Co.’s G-Map U.S. West and G-Map U.S. East  were released back in October and January.  It now allows for turn-by-turn navigation via GPS on your iPhone via an update that was released in February. 

The G-Map application is the first on-board GPS navigation solution to be made available for iPhone and iPod Touch download. This cutting-edge GPS-enabled application features an intuitive user interface with functions essential to the mobile consumer. Unlike other network mobile navigation services, there is no monthly fee involved and it makes instant route guidance without interruption. No internet or wi-fi connection needed to get you to the desired destination.


The app is available for $19.99 and works well from what have seen so far.  Check out the video below for a demonstration.


[via MacRumors]