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Obstructions (Navigation) (Dcnu)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigation processes (Dcnb)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
            Obstructions (Navigation) (Dcnu)
                 Use For: Obstacles (Navigation)
                Clearances (Navigation) (Dcnuc)