The German U-Bootwaffe believed that radio transmissions from U-Boats of less than thirty seconds could not be detected by Allied Direction Finding or DF equipment. Wrong. The Germans never realized that the Allies had invented a far more sensitive system: High Frequency Direction Finding (HF/DF), or “Huff Duff” as it was known, which picked up transmissions immediately.
Charles McCain is a Washington DC based freelance journalist and novelist. He is the author of "An Honorable German," a World War Two naval epic. You can read more of his work on his website: http://charlesmccain.com/ View all posts by Charles McCain