Marauder's Map

[John Kearns]

No: HPFGUIDX 130557

> > Kaylee Tonks-Lupin:
> >  
> > I wouldn't think so. Sorry for not having the canon to prove it 
> > (help would be much appreciated) but I believe the MM would only 
> >  show places the Marauders had visited. 
> >  
> 
> Finwitch:
> 
> I think it was required to enter a place to put it onto the 
> map. They may have figured out the basilisk etc. but NOT enter. 
> (None of them is/was a parselmouth, after all)
> 
> Aside from the Chamber, there's also the Room of Requirement that 
> doesn't appear on the map -- as the Marauders never found it.

When Kaylee asked for canon evidence, the first thing that popped 
into my mind was Hagrid's hut.  Remember in PoA, Lupin describes how 
he was watching the Map and saw the trio enter Hagrid's hut, and 
then when they left, they were "accompanied by someone else 
(Wormtail)."  The logical assumption is that the interior of 
Hagrid's hut is a 'dead zone' where the map doesn't work, or Lupin 
would have seen Pettigrew inside.

This also would explain why Wormtail was hiding in the hut in the 
first place.  He disappeared well after Harry learned who he was, 
and he knew he was in danger of being discovered on the map - 
particularly since, as Ron's pet, he would frequently have been very 
near Harry.  So he sought out a hiding place where he knew the map 
wouldn't show him.  He helped write it, after all.

Presumably the map doesn't show the inside of the hut because the 
Marauders never went there themselves.  Which makes sense - how many 
students have actually been in there, especially in the days before 
they had to hide from Blast-Ended Skrewts?

It's also interesting that you bring up the Room of Requirement - it 
made me think, what about all those rooms that move around or change 
places?  Or the staircases, for that matter.  Would they change on 
the map as well?  Hmm.

John