in fallout 3 (or new vegas, can't remember) there was a perk (level 30 i think), that put every unexplored location on the map.

since there is no such thing in fallout 4, is there any console command to make that happen? or could there be a mod for that?

"tmm 1" console command shows all map markers.
"tmm 0" hides all map markers, including everything you've discovered.