Keep in mind that most gods are not assumed to be omnipotent, except in a few monotheistic religions. Non-omnipotence implies that they have to obey the basic rules of whatever reality they inhabit, or at least some of them. A non-omnipotent god probably can't do instant teleportation through space. Maybe they can convert themselves into light and travel at light speed, but as far as we know you need to warp space to do better than that. Perhaps they can warp space with willpower alone, but that might be tiring over vast distances. It isn't unusual for a god to be portrayed as using a chariot or steed, so why not a ship? If it's easier for the god to build a warp drive and take a relaxing boat trip across the cosmos, why not? Any sufficiently advanced magic is indistinguishable from technology.