The person locator function isn't necessarily all that accurate but it get's close especially if you have gps and aren't underground or something. I don't use a data plan so i can't see the maps when I'm not on a wifi connection. I wish it allowed you to download specific areas of a map so I could keep track while I'm on the road. Otherwise a must have app. If I had data it would be even more so. I can also always see where my gf is which is cool, if I were her it'd freak me out but she seems cool with it.