I just took a 60 mile trip and was checking My Location on the Google Maps for Mobile. To my surprise, it was pretty accurate during the whole trip. The map would place me on the highway or within a 50 yards of the highway along the route.
Another interesting detail, I didn't have to request the location all the time, the position would adjust as the car was moving - very much like the it does on the GPS.
That brought an interesting thought - Now Google has not only the locations where their devices are being used, but the movement patterns as well. That's a lot of information that can be used for both good and not ...
Crossposted from http://blog.tfanshteyn.com