I realy hope Apple can update the GPS software on the iPhone...
I have 5 bars as signal strengh, full 3G network and 3 cell tower in my line of sight, the GPS on the iPhone (google maps) says i'm 52 meters west of my real location, and dispite the fact that i'm standing still, it says i'm moving!!!
At the same time i have my old phone running TomTom, and it says i'm 0,28 meters off my real location and NOT MOVING!!!!
From this experience, i can say for shure that this is not a signal based problem, it must be a software problem.
In the middle of the city, it usualy says i'm 2 to 5 street's over from the one that i'm realy on. TomTom is dead on acurate in the same situation.
A Turn by Turn system wouldn't be of much use like this.
Apple, please fix this!!!
P.S.: sending a e-mail to Apple to report this problem is... useless!!! I've sent 3 e-mail's to they're "helpdesk" for 3 diferent problems that i found and dispite the fact that i recieved a automated response saying that i would recieve a response to my problem in the next 48 to 72 hour's, i never did recieve that responce and it's been 1 and 1/2 weeks....