In a position authentication system and electronic equipment used for the same, image data photographed by a digital camera 1 are written into storage device 3, and at the same time GPS electric wave 5 is received by GPS receiver 2 to generate latitudelongitude information. Band boundaries may be modified to include spare sectors from guard areas between bands to achieve field defect-slipping. A planar adhesive closure piece may be produced more economically. The pistons are connected to a scotch yoke which translates the reciprocating motion of the pistons to rotary motion at a shaft in the engine mode.