A method of navigating an area using a mobile robotic device may include receiving, from a video camera, information associated with an edge located on a surface, determining, by a mobile robotic device, a position of the mobile robotic device on the surface relative to the edge and using the received information to move the mobile robotic device from the determined position along a path. Each difference may be recorded in an output file. The front ends of the longitudinal wall parts are provided rearwardly of the radiator. The wetting behavior especially of hydrophobic materials may significantly be improved. The guide has a sliding member with an inner portion that travels along the guide and an outer portion that extends from the guide contactable by the contact piece. Method of fabricating a Superlyophobic Surface Structure.