Real de Tayopa, this is one of those maps, you could put up on the wall, throw a dart and hit something important. Let's see if I can pick out a couple signals here.
From my file of definitions for marked spots.
"Black outline circle around other marked places, indicates this site is the most significant (a small solid filled circle inside another marking, pinpoints the exact location). At locations believed to have been used by bandits or outlaw gangs, indicates possible sites used by them. Black rectangle outline boxes show danger, death traps, explosive devices, bombs, or live ammunition."