Oleaceous Shadow Spiders from Mars

If kept far away from the subconscious minds of organic lifeforms on board your ship (where they can wreak havoc), these shadow spiders often keep the rudder post and the imaginary warp drive ball bearings well lubricated, just by skittering around on their own. Some astronomers experiment with using the fractal dimensions of the shadow spiders to chart complex deep space courses, but naturally not everybody is comfortable hurtling through an asteroid field at Mach 900 with only the self similar re-iterated patterns of some hideous oily ethereal arachnid to guide and comfort you, but the mathematicians are quite certain that this form of navigation is the most powerful and flexible available. Plus they keep shadow mosquitoes, parallel universe midges, and anti-matter flies down.