PURPOSE: To record a stop mark at stop of a mobile object on same recording paper as correction information of a moving distance when the mobile object moves in an area covered by an optical signal sent from a light emitting device of a stator side and a light receiving level of an optical signal received by a light receiving device of the mobile object side is continuously recorded on recording paper at a paper feed speed according to a mobile speed detected by a speed detection means. ;CONSTITUTION: A recorder 11 of a mobile object is provided with a light receiving level recording section 4 continuously recording a light receiving level outputted from a log amplifier 3 onto recording paper as a voltage change, a recording paper feed speed control section 8 applying paper feed control to the recording paper at a paper feed speed according to a recorder use distance pulse outputted from a distance pulse interface 7, and a marker recording section 10 recording a marker onto the recording paper upon the receipt of a stop confirmation signal from a non-signal sensing circuit 9.;COPYRIGHT: (C)1996,JPO
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