Huff-Duff

[ huhf-duhf ]
/ ˈhʌfˌdʌf /

noun

a method used by the Allies in World War II for locating enemy submarines and other naval or land targets through simultaneous bearings on their radio transmissions.

Origin of Huff-Duff

vocalization of the abbreviation h.f.d.f. for high-frequency direction finder