Think about it logically, what use would an outdoor action camera be if it needed to be connected to the Internet.
Never used Apple TV before, but guessing that streams films from the Internet?
If it streams them from another mac/pc in the house, that would also technically work in he middle of a wood as long as there was power and a router.
Anyway, you turn wifi on on the go pro, then connect to it with the iPhone through settings like connecting to any other wifi network, then open the go pro app and you get a live view and all the controls, it's good stuff.