Oh, so THAT'S how triangulation works. Much like melo_toni I felt lost at first though that may because I skimmed the explanation expecting to figure it out on my own (I didn't) but once I understood that the compass was measuring from the pov of the landmark the whole thing clicked.
Interesting mechanic and a cool twist on the wildcard, though without the little blurb in the description stating that all maps had been lost this feels less like rediscovering forgotten knowledge and more acquiring new knowledge. But that might just be a matter of semantics, really.