selected division is read from the map data recording medium 12 and a transfer is made to a step 105 at the step 105 the crt controller 20b is operated in accordance with the read map data and the map is displayed on the crt 10 then at a step 106 it is determined whether the position of the vehicle on the map displayed on the crt 10 has been entered by the occupant if it is a transfer is made to a step 107 so that the present position is displayed on the crt 10 at a step 108 whether the vehicle has traveled more than a predetermined distance from the vehicle position displayed presently on the crt 10 is determined in accordance with the distance signal generated from the distance sensor 18 if it is determined that the vehicle has traveled in excess of the predetermined distance a transfer is made to the next step 109 where the present position of the vehicle is computed in accordance with the heading signal generated from the heading sensor 16 during the movement of the vehicle and a transfer is made to a step 110 at the step 110 it is determined whether the thus determined present position of the vehicle is within a specified area on the displayed map if it is a return is made to the step 107 on the contrary if the present position of the vehicle is otuside the specified area of the map displayed presently on the crt 10 a transfer is made to a step 111 thereby inputting the information of the.