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Mobile communication services and Location based services are challenging application areas of wireless communications. Many applications were developed which require mobile navigation. The most known navigation systems are car navigation systems. Fewer advances have been made in pedestrian navigation systems (PNSs). There are some targeted achievements but the most challenging task is to develop PNSs for guiding people in different areas, outdoor or/and indoor, especially in metropolitan areas. Car navigation systems and PNSs have the main requirement but also differences: restrictions of the movement and data entries. This paper presents an application which belongs to Mobile communication services and Location based services, namely a PNS for finding a car. It will be included in the car's key and will guide the user to find his/her car previously left in a certain place.