This command enables and disables (toggles) terrain incognita. Terrain ingcognita is the hiding of unknown (i.e. unexplored) parts of the map.
Search Our Database of 304 EU4 Console Commands
If terrain incognita is enabled, this will disable it. If terrain incognita is disabled, this will enable it.
This example is the same as the first, debug_ti is an alias for the ti command.