PURPOSE: To make address detecting means simple and to eliminate the influence of the address detecting means upon an automatic steering device by utilizing the induction wires of the automatic steering device for detecting addresses as well.

CONSTITUTION: An oscillator 1 is installed on a ground side, and low frequency electric current is flowed from the oscillator 1 to induction wires 2a, 2b, the magnetic fields induced by which are detected with antennas 4a, 4b installed on the moving object side. The varying intensities of said electromagnetic fields are fed through an electric wire 6 to a receiver 3 installed on the moving object side and are further fed as ordinary control signals to a control board 9 installed on the moving object side, whereby the steering of the moving object is controlled. Further at every address, the induction wires 2a for automatic steering are extended at a right angle to the arrow Y in the traveling direction, and an independent antenna 5 detecting these are installed to the moving object, whereby the addresses are detected.