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radio direction finder

a navigational aid establishing a fix by means of the bearings of two known radio stations.
Abbreviation: RDF.
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for radio direction finder

automatic direction finder

radio receiver and directional antenna system used to determine the direction of the source of a signal. It most often refers to a device used to check the position of a ship or aircraft, although it may also direct a craft's course or be used for military or investigative purposes.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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