So you need 3G for this to work? If so, why can't you use GPRS isnt that what tom tom and other sat navs use? As you usually get GPRS 99% of the time![]()
I don't think you understand what GPS Navigation is. It uses GPS chips to sync with various satelites to identify location using longitude and latitude.
3G and GPRS is mobile data service are used to download various information such as map and route information. Hence without GPS chip, you can only "estimate" your location base on closest cell phone towers, which defeats the purpose of this app.
Reason why we are referring to 3G iPhone only, because 3G iPhone has GPS chip, and first generation doesn't. However, you can buy an external GPS addon to enable usage of this app.