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{{r|Direction finding|Direction finding|**}}

...ansmission, must remain secret against the threats of traffic analysis and direction finding.

{{r|Direction finding||**}}

...Second World War]], a U.S. Navy [[SIGINT before the Second World War#Naval direction finding and message interception|intercept station]] for communications intelligenc

...hearing the signal until it determines the new frequency. In like manner, direction finding systems may not be able to follow the changing frequency long enough to get

...tially, the policy was that the South Vietnamese would be trained in basic direction finding using "known or derived" technical information, but, for security reasons,

...h. If the EPIRB does not transmit the GPS coordinates, it may take several direction finding passes of the satellites to localize the beacon. Still, unless GPS is in us

...based on a now-outmoded VHF communications ssytem called NDRS. This has no direction finding capabilities, gaps in geographic coverage, and was based on single channels

...d the U-Boat Enigma cryptosystem traffic. But "HF/DF" Signals intelligence#direction finding|High Frequency Direction Finder) was still able to find where the U-Boats w

...nmi in his position calculation. During Jutland, there was limited use of direction finding on fleet vessels, but most information came from shore stations.

...order of battle and movement information on the Japanese came purely from direction finding and traffic analysis.

...ligence, both from [[cryptanalysis]] of the [[Enigma machine]], as well as direction finding.

His other developments were in [[Optical fiber|fibre-optics]], radio direction finding, [[infrared]] night viewing and (possibly) [[radar]]. Questions remain abou

His other developments were in [[Optical fiber|fibre-optics]], radio direction finding, [[infrared]] night viewing and (possibly) [[radar]]. Questions remain abou

These protect against traffic analysis and, for transmitting sites, direction finding.

In December, U.S. Army signals intelligence aircraft, using direction finding techniques, located a Viet Cong radio transmitter in Tan Thoi hamlet, 14 m