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Aids to navigation (Dcnsxb)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigational aids by reference to craft (Dcnsx)
                    Aids to navigation (Dcnsxb)
                        Aids to air navigation (Dcnsxbb)
                    Onboard navigational aids (Dcnsxp)