When the Captain refers to "Huff-Duff," he is referring to high-frequency direction-finding. This was a key method of how Allied naval forces detected and tracked German U-Boats: the Kriegsmarine's U-boat fleet maintained a high amount of radio traffic with its shore command and with each other for their Wolfpack tactics against Allied shipping. Huff-Duff allowed Allied naval ships to detect those radio transmissions and determine the location of those transmitting ships to attack them.

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