Silent Cartographer (Building)

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The Silent Cartographer, as referred to by the Covenant, is the map room for the Halo installations and the Ark. It can pinpoint and access every room or location on or beneath Halo's or the Ark's surface.

Location
On Installation 04, the Cartographer was located in the middle of a large island. The security system was located in a tunnel, atop a large Forerunner structure in about the center of the island. After disabling the security system, the main passageway to the map room was opened. For additional security measures, the Cartographer's chamber and activation panel were located on the other side of the island, and buried at least half a dozen floors below ground. The path down to the Cartographer is a labyrinth of twists and turns, making it easy to get lost. This could also be part of the security system, to make the map room harder to find. After activating the Cartographer, Spartan-117 found a way to reach the Control Room- by riding a Pelican into the pit via a secret 'trap door' at the top of the island.

The Cartographer was never seen on Installation 05, but was mentioned briefly. On the Ark, 343 Guilty Spark leads The Chief and The Arbiter to the Cartographer, opening locked doors along the way. The interior of the structure leading to the Cartographer is similar to that found on Installation 04; a series of ramps, twists, and turns. Rather than sitting adjacent to a seemingly bottomless pit (like the Cartographer of Installation 04), the Cartographer activation panel sits atop a large "U-shaped", construction overlooking a vast sea of water and a massive cascading waterfall. The structure of the Cartographer building and chamber is of similar design to that of Halo's Control Rooms externally.

Security System
The Silent Cartographer is protected by an elaborate security system. This system can only be activated and deactivated by manual physical contact. In order to access the Silent Cartographer one must enter a first building to disable the security system, and then enter a separate structure which contains the map room. This gives the map room double protection making access difficult and defense much easier. The weaponry wielded by the crew of the Pillar of Autumn was not powerful enough to penetrate the doors inside the facility where the Silent Cartographer was located, indicating the doors were of extremely durable material. Other than near impenetrable doors, both physically and in protection against AI, the nature of the Silent Cartographer's security system is not touched upon in the game.

Halo: Combat Evolved
In 2552, the Master Chief and two squads of marines were ordered by Captain Keyes to attack the Cartographer so that they could locate Halo's control room. The soldiers landed on a Covenant-controlled beach which was quickly captured. While taking shelter under an enormous structure, the Chief and his Marines received a Warthog from Echo 419. The Chief and two Marines used the Warthog to get to the entrance of the facility but both Marines were killed by Hunters. The Chief captured the entrance but was locked out of the lower areas. The Chief goes back to the Warthog and finds the island's security center, guarded by many Covenant and an ambush by two Hunters orchestrated by Zuka 'Zamamee. After unlocking the map room, the Chief heads back to the Cartographer and battles his way down to the map. Once on the surface again, the Chief goes to the newly-located control room with the help of Echo 419. It seems that on the map, the Control Room is illustrated as a shrine.

The Ark


During the UNSC and Covenant Separatists' assault on the Ark, John and the Arbiter discovered a massive cartographer sharing the same purpose as the other Halo Installations map rooms. They are led to the control room by 343 Guilty Spark where they activate the cartographer and view a map of the Ark.

Trivia

 * On the Halo 3 level The Ark, 343 Guilty Spark refers to the map on the Ark as the "The Silent Cartographer", but it is stated in The Silent Cartographer that it is the name that the Covenant uses for the map. Either the Covenant used the proper name for the map, or Spark said it as a courtesy to the Master Chief.
 * It is unknown if all of the major Forerunner structures have one, for example Shield Worlds.