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Navigational aids (Dcns)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigation processes (Dcnb)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigation systems (Dcnsb)
                Navigation charts (Dcnsj)
                     Related Term (Associative): Charts (Xxvmc)
                Navigation devices (Dcnsp)
                     Related Term (Associative): Instrument panels (Qpeyj)
                Navigational aids by reference to craft (Dcnsx)
                Navigational aids specific to a craft or vehicle (Dcnsy)
                Distress alerting systems (Dcnsz)
            Obstructions (Navigation) (Dcnu)
                 Use For: Obstacles (Navigation)