"By the way, is your GPS precise enough to position your car when inside the garage?"
100% yes (even if it lost GPS signal, I assume the car itself would be able to calculate speed, direction etc enough to formulate its position within a high degree of accuracy. For example, last week I drove through a long snow tunnel on my way to and fro Vancouver, and the car had no complaints driving itself and keeping track of its position on the map. I don't pretend to know exactly how it all works though).
Update: I am reading directly from Tesla's API which provides vehicle data from the car's internal systems, including GPS.
