It's supposed to guide us to the house, though the details on how that works isn't in here. I can only assume there's a path this thing is set to and for all I know it could technically be the shortest route...if you go through everything in that path, that is.

[Sigh.]

But it also only seems to work when you're around.

[And he's not touching that thing while she's here nope. At least not right now.]

After a certain point it will just stop like it lost power—or magic or whatever.