Guild Navigator
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In the Dune universe, Guild Navigators are humans, mutated through high consumption of the spice melange, who are safely able to navigate interstellar space in a Heighliner. Guild Navigators are specially selected for their prescience, which is required for their position.
History
The Spacing Guild first started using Guild Navigators because the travel technique of foldspacing was not safe; only about 1 out of every 10 Heighliners made it to their final destination before Navigators. Norma (the first Navigator and the creater of the Spacing Guild) at first used super-computers to Navigate space but as the Butlerian Jihad did not allow for "thinking machines" she used spice to develope the ability to see the Heighliners path before the Heighliner actually flew.
Mutation
Guild Navigators are continuously immersed in highly concentrated amounts of orange spice gas and a micro-gravity environment. This changes their body as the spice develops their prescient abilities. The first external sign of melange-induced metabolic change is that eyes become blue on blue. For those who wish to hide their use of large doses of spice, efforts must be taken to hide the entire eyeball that has become tinted blue. This is done through the use of large contact lenses that cover all the space visible between the eyelids. Few people have actually seen a Guild Navigator: They use envoys and ambassadors to present a human face and hide their deformity from those with whom they deal.
Description
Because the Spacing Guild uses mainly envoys and ambassadors Guild Navigators are seldom seen, therefore descriptions vary. Most agree that Guild Navigators are greatly mutated humans who appear almost amphibious, with enlarged heads, a triangular mouth, and atrophied extremities on bloated bodies. Although their appearance was a mystery in the original novel Dune, one is fully revealed in the first chapter of Dune: Messiah. Here, the Guild Navigator Edric is described as having rodent-like eyes, a thin fish-like mouth, webbed feet, and grossly elongated fingers and hands.