Device for determining the position of an aircraft at an airport, includes a plurality of sensors for detecting at least one radio signal originating from a vehicle, in which the plurality of sensors are preferably positioned at regular intervals from one another on parts of the airport which are accessible to the vehicle. The link mechanism has a fourth link member that prohibits return from a moved position to an initial position after movement by the strap, and since an unlocked state of the reclining mechanism is maintained even if a pulling operation of the strap is stopped, the seat back can be reliably folded and stowed. In addition, by using the portion of the C-band optical signal filtered out during gain flattening, energy usage efficiency is improved. The processor determines where the first load instruction has a load-hit-store conflict with a first store instruction. The outer layer is connected to ground or otherwise relatively low potential.