Compasses are basically tiny magnets that are attracted to the magnetic poles of the Earth.
They’re fascinating. They don’t usually look like much – a round casing, some lettered markings, and a red-white dial rotating about the center – but their ability to guide, to lead. They are an invaluable tool for any adventurer. Any person, really.
God Eater has a compass. Believe it or not, it actually has symbolic purpose. But the anime still misdirects itself regardless.