In the multiplayer maps have a high regard for the players, that is, if a player reads a Mod that was discovered by a player, he looks at the map only what that player has been discovered previously. Players can use their duplicate Mods and thus, different players see their discovered areas together. The position of other players who hold the same Mod is also displayed and when Mods were hung in a picture frame, you can see also the position on the map.
The Mod does not initially planned as the Nether. The location arrow turns in a circle, much like a compass or a clock. The uncovered circle is smaller and it seems only a gray and dark orange texture.
If you create a map in the end, it behaves just like the Nether, but does not rotate the position arrow in a circle.
Notch said he had programmed Mods to facilitate the work on books written by players texts or images with custom textures.
It can not have more than 65,536 unique on a world map.
If there are too many Mods, when crafting a new map, the message “Can not craft map: too many maps” will appear. For the full version 1.4 (12w34a) can not open a blank map if there are too many Mods.
The Mods feature currently only on the surface. Notch said, however, that maps of caves was an interesting idea.
Notch is also seeking that the Mods can be attached to blocks. For the full version 1.4 (12w34a) this is now possible through the context.
The maps are automatically named top left: map_ [Mapnummer]. This has been removed since the full version 1.4 (12w34a). The Mods have the number in the name, for example: map # 1
Until the full version 1.0.0 was on the top edge of the map east. This was fixed by simply changing the directions were changed.
All maps have been produced before the full version 1.4 (12w34a) have the 1:8 scale.
One Mod is connected to its copies. That is, if one with a map to explore a new country, this will be displayed on all the others.
Maps are stored in the map Item format, see there.