Open a map in the map device and step through its portal.
The Map Device is a world object that allows the player to access certain areas by placing items such as maps, map fragments, or other map-related items inside it.
The first interactable Map Device the player encounters is located in The Chamber of Sins Level 1 in Act 7 to use Maligaro’s Map quest item to enter Maligaro’s Sanctum. This Map Device cannot activate any other map.
In the Epilogue, players will gain access to a fully functional map device in the Karui Shores. After completing the mission A Call to Arms, the player will also receive a personal Map Device decoration which can be placed in your hideout and used instead. This personal Map Device can then be used by any character that has completed Act 10.
In order to activate the device, maps, one or more map fragments, and/or miscellaneous map items need to be placed inside the Map Receptacle. Generally, only one item is required, but for certain map fragments the player may be required to arrange the fragments in a certain order (typically as keys to an endgame boss).
It is also possible to place other map-related items alongside a map for bonuses:
By default, the map device has 4 items slots. A fifth slot can be unlocked by completing the Domain of Timeless Conflict with four Timeless Emblems, as shown in the Atlas quick guide.
The map device can also add one of several different map crafting options to map areas, including a boost to item quantity up to 8% as you complete maps (the default), guaranteed previous challenge league encounters for the price of a couple Chaos Orbs (also known as Kirac mods, unlocked as your complete maps), or rarely other mechanics such as Monstrous Treasure through the use of several Atlas passive skills. It also adds the ability to add a guaranteed Master mission to a map, provided you have at least one Atlas mission stocked for that map tier.
Later on, upgrades to the map device may be used to complete the Atlas questlines, and eventually advance progress with the Maven or the Eldritch Horrors mechanics by Maven witnessing the Map Boss or adding Eldritch influence to your maps respectively.
Six portals to the map area are opened when the Map Device is activated. Each portal can only be used once and are shared amongst a party.