To simplify this task, a compass card driven by the aircraft's magnetic compass is added to the RBI to form a " Radio Magnetic Indicator " ( RMI ).
2.
An aircraft can follow a specific path from station to station by tuning into the successive stations on the VOR receiver, and then either following the desired course on a Radio Magnetic Indicator, or setting it on a Course Deviation Indicator ( CDI ) or a Horizontal Situation Indicator ( HSI, a more sophisticated version of the VOR indicator ) and keeping a course pointer centred on the display.
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