*Within the imperium there exist technologies that allow ships to travel without the use of Navigators, however they are often turned illegal or pushed towards obsoletism, most often due to the Navis Nobilite houses' desire to hold their monopoly over space travel. Among them there exist: [[Prognosticator (cogitator)|Prognosticator]]s, considered a heretek that allows for calculated jumps no other cogitators are able to provide;{{Fn|31b}} [[Klenova Class M Warp Engine]]s, which although legal and still produced, is currently litigated against by the Nobilite, and use of them brings ire of the houses upon the particular fleet owner;{{Fn|31c}} [[Immaterios Novis]], a purported tech of [[Xeno Hybris]], said to utterly replace the need of Navigators, with faster short jumps, a matter of particular interest to many parties;{{Fn|4c}} [[Void Abacus]], archeotech from the Dark Age of Technology, allowing for unpiloted jumps to be at least 4 times longer, while the Navis Nobilite can't outlaw them against the will of [[Mechanicum]], they devote their means to acquire and destroy any Abacus that ever surfaces.{{Fn|12e}}

*While rare it isn't impossible for Space Marine chapter to make a Navigator into a full-fledged Marine, an idea not foreign to Ultramarines, who denoted one of their Navigators as too old to undergo the full initiation.{{Fn|44}} Uniquelly [[White Scars]] Space Marines chapter is noted for possessing high numbers of Navigators turned into full brethren. Those Navigator Space Marines are rarely committed to battle.{{Fn|16c}}

*During the so-called [[Carnivoration of Cel]], three noble houses of the [[Askellon Sector]] exhibited an indirectly cannibalistic practice by feeding their stock of [[mhoxen]] with animals injected with cerebral extractions of ritually slaughtered Navigators. This manipulated mhoxen flesh was said to grant the nobles purity of senses, allowing to fully appreciate other flavours. The practice lead to rampant mutations within those houses members.{{Fn|18a}}

*[[Psycharus Worm]] is a [[Halo Device]] resembling a brass grub, however when exposed to a source of warp energies it animates and exhibits terrible intelligence, alongside the power to animate the dead and use them as its puppets. When exposed to a Navigator it instantly jumps towards their warp eye, in return for opening the warp gate, granting them its power and dark alien murderous desires.{{Fn|37a}}