Hi All,

I may be doing a fiar bit of driving in unfamiliar territory soon and could do with using the iphone (4) as a satnav on occasion. Is there a free or cheap app which is more efficient in terms of data usage than the standard offering from Apple (Which I presume downloads maps as you use them, if I could use an app where preload Surrey maps and it then just had to work out where it was and where it was going, I presume that would use less data (i'm a long way off "All you can eat").

TIA

Chris