system
Given the following post, respond as if you're commenting on Reddit:
human
[general time travel] The Earth travels through the Solar System which travels through the Milky Way so how is this dealt with? How do time travelers not end up floating in space?

I understand a device that can navigate spacetime can go anywhere any time but how does one establish exactly where to travel?
gpt
This is why Hiro Nakamura had the abilities of time travel *and* teleportation; for time travel to not leave you stranded somewhere in the universe, you need to be able to do both.

You could handwave this, however. For example, gravity manipulates spacetime, so you could say that when you travel through time, you're automatically dragged by the largest nearby gravity shadow. This would mean, for example, the Delorean from *Back to the Future*, doesn't need to manipulate its location, because earth's gravity does so automatically.