A round red and white compass.
Shows the icons of special rooms (Item Room, Boss Room, the Shop Room, the Arcade Room, Mini-boss Room) on the map without revealing rooms.
The compass does not reveal secret rooms. This will reveal if Greed is present by displaying a mini-boss icon with the shop icon. In this way, it might also reveal if Greed is present in the secret room, relevant for late-game (and thus, the location of the secret room itself as well).
Does not work if Curse of Darkness is active.
Treasure Map - Reveals entire map layout as well as locations.
The compass icon is the same from the first Legend of Zelda game.