Information on how to use the Google map while offline
MapsOffline4iPhone has build a iphone app that can manage the Google Map Cache so that can use it during offline.
for those have interest, can look at here : http://mapsoffline.wordpress.com/maps-offline/
screenshot of it

By using this program, user can have faster respond , and no need to pay for the GPRS data fee. And for the iphone Real GPS solution, this also meet not only iPhone user can use gps solution, but also the iPod Touch user can use the gps program on the road.
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[...] sometimes. It looks like it’s working over Edge, but I am sure that you would still need to download the Google maps for your are so it’s not refreshing the map [...]
Check out Wikimap. It allows users to save open street maps (osm) for offline map navigation and browsing.
http://wiki.alumni.net/wiki/Wikimap