The document discusses various location-based systems and services using ubiquitous computing technologies. It describes mobile phone-based navigation services, RFID technologies like Suica cards for transportation payment and information access, and a ubiquitous communicator device for guiding tours in Tokyo and providing location-based information and multimedia about artworks. Key elements discussed include using GPS, cell towers, RFID, and infrared/active RFID technologies to determine location and deliver customized information and services to users.