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Distress signals are communicated by transmitting radio signals, displaying a visually observable item or illumination, or making a sound audible from a distance. 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]:
Typically, the warning is given via some innocuous signal embedded in normal communication, such as a code-word or phrase spoken during conversation to alert other personnel. Alternatively, the signal may be incorporated into the authentication process itself, typically in the form of a panic password , distress password , or duress PIN that is ...
A PASS device (personal alert safety system), also known as a distress signal unit (DSU) or ADSU (automatic distress signal unit), is a personal safety device used primarily by firefighters entering a hazardous or "immediately dangerous to life and health" environment such as a burning building.
Operators are required to cancel falsely sent distress alerts with a transmission on the channel designated by the distress signal. [10] A coast station which receives a DSC distress alert will wait 2.75 minutes prior to sending an acknowledgment to allow other vessels in the nearby area to receive the alert. This helps shore stations narrow ...
Pages in category "Distress signals" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. ...
Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications.. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organizations such as firefighters, police forces, and transportation organizations also use the term.
Illumination flares being used during military training exercises Flares being fired from a ship during a fleet review. A flare, also sometimes called a fusée, fusee, or bengala, [1] [2] bengalo [3] in several European countries, is a type of pyrotechnic that produces a bright light or intense heat without an explosion.
The signal is performed by holding one hand up with the thumb tucked into the palm, then folding the four other fingers down, symbolically trapping the thumb by the rest of the fingers. [3] It was designed intentionally as a single continuous hand movement, rather than a sign held in one position, so it could be made easily visible.