As long you get it locked once with the Network data connection guide. Then close it down, next time it will be faster to get a lock without Internet connection. But if you restart your device, it will take somewhere between 20 to 40mins to get a lock without the guide of data connection. Mine works but i warmed up the GPS first with data connection before I leave the house. Then when I leave the house I just reopen the app again and let it search for satellites using Location app.