It’s not clear. When Crouch is confessing everything under Veritaserum, he says that he saw his father entering the grounds on the Map, and so headed into the grounds to intercept him. He says something along the lines of “Then Potter came, and Krum”, and it’s ambiguous as to whether he sees them appear on the Map or if he sees them him person.
So no foreign professors!
I couldn’t swear to it, but I thought the map showed Krum in GoF.
It’s not clear. When Crouch is confessing everything under Veritaserum, he says that he saw his father entering the grounds on the Map, and so headed into the grounds to intercept him. He says something along the lines of “Then Potter came, and Krum”, and it’s ambiguous as to whether he sees them appear on the Map or if he sees them him person.