O mapa parece continuar a funcionar sempre que o usuário estiver com o objetivo "bom". A frase "juro solenemente que não estou fazendo bem" parece ser a senha.
“If you haven’t been helping him,” he said, with a furious glance at Black, “how did you know he was here?”
“The map,” said Lupin. “The Marauder’s Map. I was in my office examining it —”
“You know how to work it?” Harry said suspiciously.
“Of course I know how to work it,” said Lupin, waving his hand impatiently. “I helped write it. I’m Moony — that was my friends’ nickname for me at school.”
Aqui, Lupin está usando o mapa para policiar os terrenos e ficar atento a Black. Esta é provavelmente a melhor instância usada em todo o livro.
Outro exemplo é Harry cuidando de Malfoy no livro 6, e Harry assistindo o ponto de Ginny no livro 7.
At once, the Marauder’s Map appeared on the parchment’s surface. Here was a detailed plan of every one of the castle’s floors and, moving around it, the tiny, labeled black dots that signified each of the castle’s occupants.
“Help me find Malfoy,” said Harry urgently.
He laid the map upon his bed, and he and Ron leaned over it, searching.
“There!” said Ron, after a minute or so. “He’s in the Slytherin common room, look ... with Parkinson and Zabini and Crabbe and Goyle ...”
He was on the point of taking out the Marauder’s Map, so as to watch Ginny’s dot for a while, before he remembered that it was the Christmas holidays and that she would be back at the Burrow.