Guys. We use the concept of North, South, East, and West to navigate earth, correct? But if you're at the poles these concepts don't exist. Therefore navigation can't exist.
Navigation is a lie. We are lost.
[spoiler]But really, hypothetically speaking how do you navigate when you're at the poles (other than walking in a straight line until you can once again distinguish between north and South)?[/spoiler]
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You still have east and west and you know where south is if you are at the north pole. Still can find your way around.
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How do directions not exist at the poles? Magnetic compasses don't work, but there are still three directions you can travel in. You just don't have the option of going further north or south, depending on what pole you are on. Aside from a magnetic compass, you can use pretty much all other traditional forms of navigation. Stars, sun, landmarks, triangulation, GPS, etc.