Compass3D for Windows Phone 7:
Compass3D displays a visual representation of your phones internal sensors.
Magnetic sensor is used for compass function, the acceleration sensors are used to support the 3D view.
The latest update adds the camera, enabling an augmented view.
Never worry if North heading is related to the top or the back of your Phone.Â With the augmented view taking a bearing is also real easy.
The main menu hold settings for acceleration sensors usage, magnetic north or true north readingÂ and augmented view. Setting changes are automatically stored.
Compass3D is a free app, but requires a active internet connection for advertising.
Compass3D can be downloaded here.