The spoken word "Mayday". There is a specific format for a distress message. The mnemonic is M.I.P.D.A.N.I.O and it goes like this:
M - Mayday (repeated thrice)
I - Identification (name and number of craft)
P - Position (latitude and longitude and/or geographic location)
D - Distress (nature of distress e.g. sinking, fire, etc)
A - Assistance required
N- Number of persons onboard
I- Information (other pertinent information)
O- Over
http://www.mcaorals.co.uk/Distress.htm
S.o.s
sos
Mayday
The first SOS distress signal was transmitted by the RMS Titanic on April 15, 1912, during its sinking after hitting an iceberg. The ship's radio operators sent out the distress signal to alert nearby vessels for help. The SOS signal, which consists of three dots, three dashes, and three dots, was later adopted as the international standard for maritime distress calls.
SOS can be defined as the commonly used description for the international Morse code distress signal. This distress signal was first adopted by the German government in radio German regulations effective April 1, 1905, and became the worldwide standard under the second International Radiotelegraphic Convention, which was signed on November 3, 1906 and became effective on July 1, 1908. SOS remained the maritime radio distress signal until 1999, when it was replaced by the Global Maritime Distress Safety System. SOS is still recognized as a visual distress signal.
The flag used to indicate distress is the International Code Signal flag "N" (November), which is a square flag with a white and blue checkered pattern. Additionally, the widely recognized signal for distress is the International Distress Signal, which can be represented by a flag or by the use of other signals such as flares or sound signals. In maritime contexts, the "N" flag signifies that a vessel is in need of assistance.
Emergency Position Indicating Radio Beacon
1. SOS 2. MAYDAY (from the French`M`aider `- Help me
SOS, the international Morse code distress signal, is a palindrome.
The abbreviation for a distress signal is DS or SOS.
Brian found the radio in the survival pack that was left in the plane wreckage. He was able to use the radio to send out a distress signal and eventually be rescued.
The distress call "Mayday" originated from the French phrase "m'aider," meaning "help me." It was adopted in the 1920s by Frederick Stanley Mockford, a radio operator at Croydon Airport in London, who sought a standard international distress signal that would be easily understood by English-speaking operators. The term was chosen because it sounded similar to "m'aider" and was easily recognizable over radio transmissions. It is now universally recognized as a call for help in emergency situations.