You zoom way out and narrow the search based on size. The two at the top of the list appear to be the biggest by far. You examine only their coordinates.
The second biggest is centered over a U.S. city. The biggest by a landslide is, luckily for the Earth you suppose, way out in the middle of the Pacific ocean.
Hey check it out. Every week we'll be revealing some new troll characters from Hiveswap until Act 2 is out. Follow the Troll Call here, and meet the first two here. Expect a few more surprises like this to drop in coming weeks.