The Maze Map is an item from the Twilight Forest mod. It is used for traversing the various mazes found in the Twilight Forest. Like a normal map, it can see through walls, but unlike the normal map, the Maze Map will show you a slice of the world at your current depth or altitude. It is zoomed in to the point where the tiniest walls are shown. It can be upgraded to show ores as well but it is a fairly expensive process that may or may not pay off.
The Maze Map can be upgraded to show locations of ores as well by upgrading it to a Blank Maze/Ore Map.