Unattended transmitters, housed in buoys anchored near channel and harbor approaches before war, aided ships through difficult waters when abnormal conditions reduced effectiveness of lights, bells and horns; pilots identified buoys by their emitted characteristic codes; radio direction finders were then used to "run them down."
Buoy radiobeacons for inshore navigation
Electronics
Electronics ; 16 , n 7
1943
4 pages
Article (Journal)
English
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