Already tried this, TMM 1 provides a quick travel to all the map markers. TMM 0 removes all my map markers. I thought that eventually I will use the TMM 0, but I play 35 hours already and I have discovered lots of map markers so exploring this again ... I thought about changing explorer perk. Now this reveals all map markers, maybe in GECK this can be modify to "delete all undiscovered map markers" but i can't do that. or... Maybe someone has another idea?