Galley units are provided having a moveable galley structure in the interior aircraft cabin. The method includes calculating, by a controller, a driving trajectory of the subject vehicle based on a yaw rate using driving information of the subject vehicle. Said aim is achieved by mounting the lantern-type housing on the valve housing by means of a bayonet joint or a bayonet-type joint. A light waveguide disposed between the polarizer and the retarder layer reduces polarization changes between the polarizer and the retarder layer.