I use Google's "My Tracks" app every day to record my running, with a GPS tracked path imposed on a Google map, and it easily shows tiny shifts in position such

I use Google's "My Tracks" app every day to record my running, with a GPS tracked path imposed on a Google map, and it easily shows tiny shifts in position such as which side of the street I ran on or whether I ran on or slightly off of a dirt path. There's no doubt something equivalent in a Model S would be able to accurately record laps in a parking lot.