Earthbound
You are magically in tune with the planet and have increased sensitivity to your relationship with it. As such:
You always know which direction is north. Any sudden change of location over one mile suppresses this knowledge for one hour, and sickens (poisons) you for one minute.
You always know how far above or deep below sea level you are, accurate to 5 feet. Any sudden change of elevation over four times your movement speed suppresses this knowledge for one minute, and sickens (poisons) you for one round.
You always know which direction is up, in relation to the planet. If you find yourself off-planet, you know where the planet is.
While you exist on planes other than the Material, you are sickened (poisoned).