How did MWPP make the Maunderer's Map?

[houyhnhnm102]

No: HPFGUIDX 154229

Allie:
 
> The Shrieking Shack isn't on the Hogwarts grounds.
 
> Can someone repost that link or email me offlist?  
> I wouldn't be surprised at all if the Map is a dark 
> object, but I don't think that the Marauders intended 
> it that way.  Maybe it acquired a life of its own 
> through their advanced magic.  Or maybe someone 
> intentionally corrupted it later - we don't know 
> where it was before Filch had it.

houyhnhnm:

What I was wondering is *why* doesn't the Map show places that are not 
on the Hogwarts grounds.  There would have been no need to map the 
Shrieking Shack and the tunnel leading to it since no one goes there.  
But it seems that they would have had an interest in knowing who was 
where in Hogsmeade and surroundings since their escapades frequently 
took them there.

It would appear that extending the Map to include territory outside of 
Hogwarts was something they were unable to do.  Why?  Was it because 
their knowledge of magic was simply not advanced enough?  But why 
could they have gotten so far--making such a map must surely have 
involved very advanced magic--and no farther, or did it have something 
to do with the nature of the magic involved and its connection to 
Hogwarts.

This is the passage that started my train of thought.  Dumbledore is 
speculating on Tom Riddle's reason for wanting a teaching post at 
Hogwarts:
"Secondly, the castle is a stronghold of ancient magic.  Undoubtedly 
Voldemort had penetrated many more of its secrets than most of the 
students who pass through the place, but he may have felt that there 
were mysteries to unravel, stores of magic to tap." (HBP20)

So I was wondering if the Marauders tapped into those stores of 
ancient magic to make the Map.  They could not plot any area that 
Hogwarts itself would not allow them to plot.  Perhaps they were 
fooling around with magic whose power they did not fully comprehend.  
They were in over their heads, so to speak, and did not realize how 
Dark was the magic they were involved with.  


Never trust anything that can think for itself if you can't see where 
it keeps its brain.
http://lunar-music.livejournal.com/1537.html

Could the unplottability of the interior of Hagrid's hut have anything 
to do with his Giant side? (Like the way he was impervious to the 
stunning spells of the aurors in OotP.)