The airport vehicle of one airport vehicle of navigation system, airport vehicle navigator and air navigation aid is arranged to search position by using airport vehicle and includes board of directors's door etc. and accurately instruct to desired target. Location detection of being in trouble step (S310), airport vehicle navigator repeatedly identify the present position of airport vehicle. In search step (S320), airport vehicle navigator searches for destination information in internal database. In display step (S330), airport vehicle navigator indicates the search destination information in screen. In front end system (S340), airport vehicle navigator indicates the road guidance information of position, present position and destination based on the airport vehicle location base on the vehicle navigator of airport.
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