

On Installation 04, the Cartographer was located in the middle of a large island.

There, they saw impressive waves of Sentinels destroy anything in their path. A different one was accessed by the crew of the UNSC Spirit of Fire during the Battle of Installation 00. This proved to be most detrimental to the Covenant Loyalists, who had difficulty penetrating the Cartographer's defenses. The Cartographers on the Ark have a powerful security system, which includes more aggressive Sentinels to anything other ones on the Ark. The map room is somewhat larger than Alpha Halo's Cartographer structure and also much more open to the outside. One Cartographer was located on top of a massive spire structure, the map room itself lying in a wide open area giving a panoramic view over a massive waterfall. These Cartographers update in real time as Refugia change and as the Halo Ring in the centre is built.

Unlike other installations, Installation 00 actually has multiple Cartographers.
