A rectangular coil has several successive windings which are made of a strip-shaped super conductor, which contains at least one core which is embedded in a normal conductive matrix material and which is made of a high-Tc-super conductor material. A link row is a series of links representing a series of roads in a road system, and as link row data, link data for the links that constitute the link row are arranged in the order in which the links are connected. The pocket delineation seal divides the panel into a plurality of pockets which will have different sizes, depending upon the placement of the pocket delineation seal or plurality of seals. The microprocessor further transfers the contents of a second one of the memory locations to be exchanged into the first memory location, and transfers the contents of the additional register into the second memory location.