It's not always obvious that your standing on a planet and that all of the people, places and wonders of the world are literally below your feet. Underview is a small reminder to look down when you want to put things into perspective.
The Underview app lets you view a map of the world looking through the planet. Using your GPS coordinates, the magnetometer to find your direction, and the gyroscope to understand which angle you are looking, Underview allows you to see through the planet to the world under your feet.
Use the camera icon to take a picture of where you are looking at, and what you are looking through and tweet it to friends.