TheCodeBreakers
frequency direction-finders to exploit the U-boat garrulity. Stations
reported their bearings to their net control center in Maryland, whence
they were flashed to the naval communications-intelligence organization
at 3801 Nebraska Avenue, North West, in Washington. Commander
Knight McMahon and his staff combined them into fixes and flashed
these to the Atlantic Section of the Navy Commander in Chief's Combat
Intelligence Division. From here they sped to antisubmarine forces.
How fast this net—called "huffduff' from the HF/DF abbreviation of
"high-frequency direction-finding"—could work was shown by the episode
of June 30, 1942. That morning, U-158 went on the air to report to
Donitz that he had nothing to report. Huffduff stations at Bermuda,
Hartland Point, Kingston, and Georgetown heard him. McMahon plotted
his positiori as latitude 33 degrees north, longitude 67 degrees 30
minutes west. This information raced down through channels until it
annaabi.ee 
