So I have some troubles with interpreting data from rotation sensor on Symbian device: I've found example which displays x, y and z angles from rotation sensor on the screen using QRotationReading class, I built this example and launched it on N8 device, but I don't understand angle values... For example, if hold device vertically in portrait mode and then rotate by 45 degrees around normal vector of the screen (vector which is perpendicular to the screen), rotation sensor retrieves x=45 and y=45. Why? According to this documentation http://doc.qt.nokia.com/qtmobility-1...onreading.html these angles should be at least x=45 and y=90! Well, If rotate device from vertical position in portrait mode around screen's normal vector, angle values are changing from x=90, y=0 to x=0, y=90. Why is it so? Can someone explain it to me?