Ops Halo Stations are large holographic projection tables used to provide 3D imaging of topography and battlefield operations. These are generally linked to satellites to provide tracking of units in real time, and are frequently used to stage large scale training exercises and tactical war game simulations.
There is one of these at the heart of the Operations Center in Hell's Gate.

Jake Sully views Hometree on a Halo Station
Sources[]
- James Cameron's Avatar: The Game - Ingame Pandorapedia