Homonculus Charm

The Homonculus Charm is a charm that's used on an Object allowing it to track all movement in an area. This charm was used on the Marauder's Map as explained in an article of 'The Marauder's Map' in Pottermore. The link: https://www.pottermore.com/writing-by-jk-rowling/the-marauders-map. When it was used on the parchment after a charm for an activation(I solemnly swear that I am up to no gooud) and an deactivation(Mischief Managed) the parchment had the Homonculus Charm used upon a map of Hogwarts. The reason that you cannot see the Room of Requirement is first the ancient magic placed upon it and secondly the Un-Plotable charm (Possibly a seriously powerful one; the room of requirement was likely made by Ravenclaw herself). This article was mostly about the Marauder's Map.