This might be clear when I actually get a Tesla and try it out, but let's assume that I am driving somewhere from my home in Toronto on a day trip. I put in the address of my destination, and I understand that the GPS will advise me whether or not I need to charge / stop at a SC in order to reach my destination. (Is that correct?) But let's assume that my destination does not have any charging availability and I want to drive home the same day. While I may have enough charge to get to my destination without charging, how will I know (or the GPS) whether I will have enough charge to turn around and not necessarily make it home, but maybe make it to a SC somewhere on the way back. Is there a "round trip" option when you plug in the coordinates?