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For cases where verbal communication (e.g. via cell phone) is possible with family member or friend, a covert phrase can be used to signal duress. In the slim chance that a captor allows the person in duress to use their cell phone (e.g. to obtain a PIN), there is a limited opportunity to use a duress code.
A distress signal indicates that a person or group of people, watercraft, aircraft, or other vehicle is threatened by a serious or imminent danger and requires immediate assistance. [1]: PCG D−3 Use of distress signals in other circumstances may be against local or international law.
These codes were rarely uniform even between local agencies. Most used “10-4” to mean “acknowledged”, for example, but some agencies used it as “message ends”. A “Signal 30” could be a fatal car crash or any death, depending on local usage. Plain language helps ensure critical clarity in emergencies. It is the clear standard.
Used when signal received is not clear. In most cases, try to add the specific trouble. Example: "Unreadable, background noise." Loud and Clear Self-explanatory Stop Transmitting Copy, Copies Used to acknowledge message received. Unit radio identifier must also be used. Example: "Engine 2675, copies." Affirmative Yes Negative No Respond, Responding
A police radio code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include " 10 codes " (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes , or ...
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The alarm signal is defined as an AM signal (A3X and/or N0N emissions), containing a swept tone ranging from 300 Hz to 1600 Hz (upwards), with 2–4 sweeps per second. PLBs shall sweep upward. [28] [29] PLB alerts are passed to State and Local agencies. [10] They must be registered to a specific person (with NOAA in the U.S.).
A signal corps is a military branch, responsible for military communications (signals). Many countries maintain a signal corps, which is typically subordinate to a country's army. Military communication usually consists of radio, telephone, and digital communications.