Not all dath ilani, but more than half, know how to find their way back to dath ilan, if they get lost somewhere inside their galaxy, and they know how to find their way back to the Local Galaxy if they're stranded on a larger scale than that. It's just a cool thing to know how to do.
Keltham has seen enough Zoomout Videos for his illusion of it to be realistic, if the illusion makes it look realistic to him. He'll run it at a speed where it takes him about two minutes to get to the Local Visible Volume.