Using smartphone with wifi and no service

[strollin]

It depends on which GPS app you use as to whether or not it needs a data connection. I have an app called Co-Pilot Live that stores all of the map data on the device so it doesn't need a data connection. The Google Nav app doesn't store the map data locally so needs a data connection. The trade off is that the Co-Pilot app uses much more of my device's storage space than the Google Nav app.

 

[carnageX]

a friendly word of caution: if you want free gps, you should probably avoid any verizon phones as those tend to have some strange conflicts where non-paid, non-verizon gps services are somehow tremendously inaccurate to the point of being utterly useless.

I've never had a problem with accuracy of my Incredible or my Rezound. Both of them are very accurate.