system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How far up into space must one go before a compass stops working, and what do they use at that point for navigation?
gpt
In the sense of it being a tool for navigation it would stop working pretty quickly, like before you leave the atmosphere. it might point north but that doesn't help you in a space ship. Once it leaves earths magnetic field it wouldn't do anything at all (no idea how big earths magnetic field is but farther than the moon)