Yes. Wifi triangulation can work, but it's not precise enough unless you have quite a few routers. You end up having to use other signals that you're nearby, an

Yes. Wifi triangulation can work, but it's not precise enough unless you have quite a few routers. You end up having to use other signals that you're nearby, and track the device's own movement, I expect. In a way, what you have here is "indoor GPS", it's just tricky to get things as accurate as we expect right now. Ultimately, I expect we'll have to rely on lots of signals, including (for some use cases) cameras or Kinect-style tracking.