As we all know that the iPhone 3G and 3GS got GPS.
And from what I know, the GPS itself is free.
But we need to download the maps from Google Maps.
Either using the 3G or wi-fi to access the internet, both terms can be used to download the maps.
And you have to pay if you're using the 3G and some wi-fi that requires login account such as tmnet hotspot etc.

ok, my questions are :

if we have used the GPS before in some particular locations and have downloaded the maps, is it possible to use the GPS at the same place later on other day/time?

if that method works, can we download mass maps, save it in the phone, and use the GPS freely?