Additionally, a listener has the ability to determine the source of a sound by binaural direction finding. Source: Internet
By the 1970s, the Post Office Handbook for Radio Operators listed over a hundred Q codes, covering a wide range of subjects including radio procedures, meteorology, radio direction finding, and search and rescue. Source: Internet
Furthermore, replies from the boats enabled the Allies to use direction finding (HF/DF, called " Huff-Duff ") to locate a U-boat using its radio, track it and attack it (often with aircraft able to sink it with impunity). Source: Internet
Detailed information about submarine movements was available. citation Both the British and German interception services began to experiment with direction finding radio equipment in the start of 1915. Source: Internet
Captain H. J. Round working for Marconi had been carrying out experiments for the army in France and Hall instructed him to build a direction finding system for the navy. Source: Internet
For example, if a certain type of radio is known to be used only by tank units, even if the position is not precisely determined by direction finding, it may be assumed that a tank unit is in the general area of the signal. Source: Internet