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Navigation (Dcn)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Automation (Dcb)
             Use For: Automated control systems
        Control systems (Dcg)
             Use For: Computer control systems; Computerized control systems
        Properties of control systems (Dch)
        Control devices (Dcj)
             Use For: Control equipment; Control system hardware
             Related Term (Associative): Equipment (Qt); Electronic equipment (Qtbe)
        Control system applications (Dcm)
        Navigation (Dcn)
            Navigation processes (Dcnb)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
            Obstructions (Navigation) (Dcnu)
                 Use For: Obstacles (Navigation)
        Train operation (Dct)
             Use For: Train handling
             Related Term (Associative): Pilotage and driving (Dcnbs); Train crews (Mtgr)