The Maurauder's Map

How could I have gone this long without posting that most excellent of references from recent pop culture: The Maurauder's Map from Harry Potter and the Prisoner of Azkaban. What a perfect example of an animated map. Wonderfully enough, there are a number of smartphone apps that can accomplish pretty much this very thing, albeit without the wands and magic and stuff... and the smartphone apps tend to only work on smaller scale GPS-driven map platforms, not larger scale indoor-type GPS... and they typically only work for acknowledged networked friends, not simply anybody one wants to do surveillance on.... unless, of course, you're a hacker... or the government.... or a corporation.