Editing Flight instruments (section)

===Nondirectional Radio Beacon (NDB)===
{{main|Non-directional beacon}}
;[[Image:Adf rmi.jpg|left|100px]]
The [[Automatic direction finder]] (ADF) indicator instrument can be a fixed-card, movable card, or a [[Radio direction finder#RMI|Radio magnetic indicator]] (RMI).  An RMI is remotely coupled to a gyrocompass so that it automatically rotates the azimuth card to represent aircraft heading.<ref name=faa/>{{rp|7-3 to 7-4}}  While simple ADF displays may have only one needle, a typical RMI has two, coupled to different ADF receivers, allowing for [[position fixing]] using one instrument.

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