Tesla Motors Club

With the 8.1 upgrade, and my phone app, I see I have the "summon" feature available to me. However, I cannot really find any information on what it actually is, and what it will or won't do.

I have a narrow entry/exit into my garage, and have to pull it in very slowly/carefully to avoid objects left and right. The sensors on the car keep me informed of where I am at, and based on those, I can pull in exactly where I want to be (12 inches from the front wall).

So will Summon do this for me? Will it pull in and out of a narrow space using its sensors to ensure the car is positioned correctly and not hit any obstacles?

I guess I am just trying to understand exactly what the feature does and does not do.