Guild navigator - Definition and Overview

In the Dune universe created by Frank Herbert Guild Navigators are humans mutated through high consumption of the spice melange, who is safely able to navigate interstellar space in a Heighliner. Guild Navigators are specially selected for their prescience, which is required for their position. Continuous immersion in highly concentrated amounts of orange spice gas changes them and develops their prescient abilities.

Guild Navigators are greatly mutated humans who appear almost amphibious, with enlarged heads and atrophied bodies. Although their appearance was a mystery in the original novel Dune, one is fully revealed in the first chapter of Dune: Messiah.