Because we like you.
Alternatively, we at the Centers project believe that maps, and GPS locations, are interesting things which are fun to utilize when investigating the real world. We also believe in the folly of arbitrary lines drawn on a map to indicate posession. These items do not occur naturally, so we thought we would have fun with them. We thought you may find this fun as well.
Project HQ is also rumored to be inhabited by a bunch of nerds, and they felt compelled to let their freak flag fly with this project.