An accelerometer of a mobile computing device is operable to provide a first input to an orientation module of the device. The orientation module is configured to use multiple signals to determine a spatial orientation of the device. A magnetometer of the device is operable to provide a second input to the orientation module. The orientation module is operable to receive the first input from the accelerometer and the second input from the magnetometer, and to determine an orientation of the device based on a combination of the first input and the second input.