Indoors on an iPhone 4. WiFi disabled
Running the LocateMe SDK sample or my own code for 30-60 seconds produces horizontal accuracy of 2294 meters. Pretty inaccurate
You can access the timestamp of the user's location used by a MKMapView as follows:
MKMapView
[[[mapView userLocation] location] timestamp];
The timestamp is an NSDate and it tells you when this location was determined.
NSDate