How Britain's Deadly HF/DF Technology Made U-Boats Panic

In March 1943, a Royal Navy telegraphist watched a single glowing needle do what no lookout, no radar and no depth charge could. High Frequency Direction Finding, known to the men who used it as Huff-Duff, turned every U-boat radio transmission into a beacon revealing its exact position. This is the story of the silent British technology that let escort ships hunt submarines before they even knew they were being hunted, and helped turn the tide of the Battle of the Atlantic. #WW2 #HuffDuff #BattleOfTheAtlantic #RoyalNavy #UBoat #WWIIHistory #NavalHistory

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