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For instance, Panamerican Airway radio direction finders on Wake Island, Midway Atoll and Honolulu each picked up distress signals from Earhart and took bearings, which triangulated in the cluster of islands that includes Nikumaroro.

He took typing in high school, making him perfect for the role of direction finder - the man who, after learning Morse code during training , eavesdropped on U-boat messages in the North and South Atlantic.

Another part of the unit used radio direction finders to look for North Korean transmitters, a job Alsop did on a few occasions.

Yaftali, the K.K.A. commander, told me that his unit’s Wolfhound radio direction finders, which allowed them to determine the range and bearing of enemy radios, picked up Taliban transmissions from inside the hospital.

One involved Noonan doing celestial navigation; the other, her use of a radio “bearing” direction finder.