A staggered keyboard for use with a portable device is provided. The clock preselecting means is designed in such a way that, depending on the state, a first clock is preselected at least at a first cell and an additional clock is preselected at least at an additional cell. The solar characterization tool has a characterizing unit for determining at least one mirror parameter of the mirror based on an initial position of the camera and the screen, and a refinement unit for refining the determined parameter based on an adjusted position of the camera and screen whereby the mirror is characterized. In addition, when a vehicle deviates from a lane, a voice warning may be output and the position of the vehicle for a road is restructured as an image.