This is a 3D theme for Marine Compass. It will show a cube where each side shows the direction you are aiming.
It is especially useful in combination with the augmented reality feature because the hole in the cube can be used to precisely aim at South for instance, and see exactly where to go in the real world.
Please note this app will not appear in the list of apps and cannot be launched: its purpose is to provide a theme for Marine Compass. It can be selected through the settings screen of Marine Compass, under the Theme option.