We proposed a searching system for wandering demented aged person using GPS (Global Positioning System), PHS (Personal Handyphone System) and mobile PC (Personal Computer). There were three subsystems: one base station and two mobile terminals carried by the aged and his family. We focused our system on reducing the mental stress of the family in the sense that, in using our system, the family does not need further assistance from others. The independence of the family is very important. In order to construct this user-friendly system, the mobile terminal for the family consisted of only the necessary input keys and the static station included a touch panel. Furthermore, to clarify intuitively the geometrical relationship between the aged and 'carer-person' in the family, the mobile terminal was able to show their loci on the same digital map in real time, and was automatically able to change the scale of the map using a GIS (Geographic Information System). We were encouraged by the results of the application of our system to a search for the wandering demented aged person.
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