Well if you happen to be a Jailbreak iPhone user that use iPhone’s Google Maps App often for navigation then I have some great news for you. Very soon a new navigation tweak will be available on the Cydia App store that will add turn-by-turn Voice based navigation on Google Maps application.
Two of the most popular Jailbreak developers, TheZimm and InfectionFX are developing this latest tweak called as Native Turn-by-Turn Directions. Once this app is out on Cydia store, it will undoubtedly going to be the most simple and cheapest way of adding detailed Voice navigation to your iPhone. Because all the Voice Navigation Apps available for iPhone at present are having quite a high price tag.
Here is a YouTube link of a Demo video released by the Developers, by the looks of it Turn by Turn Direction Tweak surely looks promising giving an innovative new add-on to the Google Maps Application.
Do let us know which GPS voice navigation iPhone application are you using? If you happen to be in India, I would love to know your Favorite iPhone GPS app for Indian roads?