automatic direction finder
nounDefinition of automatic direction finder
: a navigational tool that continuously displays the bearing of a designated reference radio beacon
But unlike some other relics, the ADF (automatic direction-finder) keeps rearing its ugly head like an uninvited relative who shows up at the family picnic. Instrument pilots who try to fly without a good foundation in ADF needlework can quickly run smack into an indigestible hash of headings and bearings.— Thomas H. Block, Plane & Pilot, January 1994
—abbreviation ADF
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