Hogwarts är oplottlig, så det kan inte läggas på en karta. Därför kan den inte visas på Google Maps eller liknande.
GoF ch.11, ombord på Hogwarts Express:
"There's traditionally been a lot of rivalry between all the magic schools. Durmstrang and Beauxbatons like to conceal their whereabouts so nobody can steal their secrets," said Hermione matter-of-factly.
"Come off it," said Ron, starting to laugh. "Durmstrang's got to be about the same size as Hogwarts — how are you going to hide a great big castle?:
"But Hogwarts is hidden," said Hermione, ...
...
"And to keep foreign wizards from finding it, they'll have made it [Durmstrang] unplottable —"
Även om endast Durmstrang uttryckligen kallas ut som (sannolikt) oplotlig, är det bara rimligt att anta att Hogwarts är lika förtrollad.