To easily determine whether rewriting of a flash memory has succeeded.SOLUTION: The electronic watch 1 includes a CPU 52 included in a GPS unit 5, a flash memory 6 having a storage area for storing a reference data table and map data which are read and referred to by the CPU 52, and a CPU 21 that writes the reference data table and the map data in a space corresponding to a head address of the storage areas 0 and 1, and writes version information for specifying the reference data table and the map data in a space corresponding to an address to be processed after the head address of the storage area.SELECTED DRAWING: Figure 1
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