Minecraft wiki entry for Explorer_Map, associated text: An explorer map differs from a map in that its display tag is set, which includes a Mapcolor and a LocName; also its Decorations list includes an entry for its target monument, mansion or buried treasure. Its map item entry is identical to that of a normal map, except that by the time the player sees it, its colors byte array is pre-filled with explorer maps' characteristic land-water boundary lines and water shading.