A location measurement system comprises: a GPS receiver for attachment to a person and for determining earth location of the person; a display for attachment to the person; memory for storing map data; a processor configured to process earth location and the map data to instruct display the person’s current location with a map on the display. In an electronic circuit unit, the metallic film is provided on a top surface of a sealing resin portion for burying an electronic component, the side surfaces of the sealing resin portion that are opposite to each other, and the side surfaces of the multi-layered substrate that are opposite to each other. The use of multiple reversible linkages connecting component parts provides for physiologically responsive activity modulation. The processor may also automatically reduce the write speed of the optical disc apparatus upon a pause condition, thereby preventing the necessity for excessive pausing. In a preferred implementation integrated circuit router chips are stacked into cubes to form the routers stages which are cross coupled using a twisted butt joint to form a WSXC switch.