The Guild Navigator's Tank as depicted in the Dune Movie (1984).
Guild Navigator Tanks or Navigator Tanks as they were simply known were both used and constructed by the Spacing Guild for the main uses of containing and protecting their Guild Navigators. Also it allowed and activated the Navigators prescience ability to navigate the complex structure of foldspace.
System Mechanics[]
Guild Navigator tanks were large, anti-gravitational tanks of Melange spice gas, in which a Navigator would be placed in at the beginning of their training as elite Guildsman. Their bodies would be suspended in mid-air, and a constant cloud-like flow of the gas would permeate the tank, being released in vents after use. A small speaker-like outlet, placed on the tank, usually at the side, allowed the Navigator to communicate to the outside (especially after their mutation did not allow them to use primary Human speech). Ordinarily, these tanks, and their respective Navigators, were guarded by a contingent of Guild servants.