Mayday Guide, Meaning , Facts, Information and Description

Alternative meanings: May Day, Mayday (music).

Mayday is an emergency code word used internationally as a distress signal. Some people say that it was derived from the French M'aidez! (help me). Most official sources, however, say that the word was made up -- like the distress signal SOS -- because it could not be mixed up with any other word, is easy to remember and can be understood even if the strength of the radio signal is weak.

It is used to signal a life-threatening emergency by many groups, such as police forces, the fire brigade, and transport organisations such as London Underground[1].

Table of contents

1 Marine Mayday calls 2 Making a Mayday call 3 Other urgent calls 3.1 Mayday relay 3.2 Pan-pan 3.3 Securite 3.4 Silence 4 See also 5 External links

Marine Mayday calls

The US Coast Guard definition of a Mayday situation is 'A vessel or aircraft are in grave and imminent danger and require immediate assistance', while the British Royal National Lifeboat Institution (RNLI) defines it as 'a situation where in the opinion of the Master a vessel, vehicle, aircraft or person is in grave and imminent danger and requires immediate assistance'. Examples of 'grave and imminent danger' in which a Mayday call would be appropriate are fire, explosion or sinking.

'Mayday' calls are made by radio, such as a ship or aircraft's VHF radio. Although a Mayday call will be understood irrespective of the radio frequency on which it is broadcast, first-line response organisations such as the coastguard and air-traffic-control monitor designated channels, such as VHF channel 16. A Mayday call is the equivalent of a morse code SOS, or a telephone call to the emergency services.

When they receive a Mayday call, the coastguard may launch lifeboats and helicopters to assist the ship which is in trouble. Other ships which are nearby may divert course to assist the vessel broadcasting the Mayday.

Making a hoax Mayday call is a criminal act in many countries, because of the danger to the rescuers' lives that a search-and-rescue operation can create, as well as the very high costs of such rescue efforts. In the US, making a false distress call is a federal crime carrying sanctions of up to six years imprisonment, and a fine of $250,000[1]. Hoax calls too, by their nature, devalue the use of the word Mayday, which rightly demands an instant and resource intensive response.

The coastguard can be contacted in situations that are not emergencies by calling 'Coastguard, Coastguard, Coastguard, this is (name of vessel)', on VHF channel 16. In many countries however, special training and a licence are required to use a VHF radio legally (though in an emergency, anyone may use a VHF to summon help).

If a Mayday call cannot be sent because a radio is not available, a variety of other distress signals and calls for help can be used. A Mayday can be sent on behalf on one vessel by another, using a convention called a Mayday Relay (see below).

Making a Mayday call

The person making the call must not make a Mayday call unless there is a real emergency, such as fire or sinking, or that person may put lives in danger.

1. The person should go to his or her VHF radio, switch it on, and set the power to High if he or she can
2. The person should select Channel 16 (156.8 MHz)
3. The person should press the microphone button (this might be labelled 'Push To Talk' or 'PTT')
4. Holding down the microphone button, the person should say
   • MAYDAY MAYDAY MAYDAY
   • THIS IS (the boat's name, repeated three times)
   • MAYDAY (the boat's name)
   • The person's location (he or she can read out the position from his or her GPS, or say something like 'one kilometer north of xxx harbour'), repeated 3 times
   • The nature of the emergency (for example, 'we are on fire' or 'we are sinking')
   • The number of people on board (for example, '5 people on board')
   • OVER
5. Then the person should release the microphone button and wait for a response (the person cannot hear what the Coastguard is saying to him or her unless he or she releases the button).
6. If the person doesn't get a response after 10 seconds, he or she should repeat his or her mayday call.
7. As well as a Mayday call, the person should use other distress signals such as flags, flares, lights, smoke, and waving both arms outstretched. He or she should trigger your emergency position-indicating rescue beacon (EPIRB) if you have one.

Once the person is in contact with the coastguard, he or she should listen carefully to the questions the coastguard asks him or her, which help them assess the person's situation and provide an appropriate rescue. Questions may include:

• Description of the vessel
• Details of any medical emergencies on board
• The weather at the person's location
• What emergency equipment the person's ship has (for example life jackets, flares, EPIRB, life raft).

The official way of making a mayday call is slightly different around the world, but all English-speaking countries will understand the person if he or she does it as described above.

Other urgent calls

Mayday is one of a number of words used internationally as radio code words, to signal important information. Senders of urgency calls are entitled to interrupt messages of lower priority. As with Mayday, the use of these terms without proper cause could render the user liable to civil and/or criminal charges.

Each of these urgency calls is usually repeated three times (eg "Pan pan, Pan pan, Pan pan").

Mayday relay

A Mayday relay call is made by one vessel, on behalf of a different vessel which is in distress. If a vessel makes a Mayday call and this is not acknowledged by the coastguard after a single repetition and a two-minute wait, a vessel receiving the Mayday call should attempt to contact the coastguard on behalf of the Mayday vessel by broadcasting a Mayday Relay on their behalf.

A Mayday Relay call should use the callsign of the transmitting vessel, but give the name and position of the Mayday vessel.

Mayday Relay calls can be used to summon help for a vessel which is too far offshore to contact the coastguard directly.

Pan-pan

Pan-Pan (from the French: panne - a breakdown) indicates an urgent situation of a lower order than a "grave and imminent threat requiring immediate assistance", such as a mechanical breakdown or a medical problem. The suffix medico is added to indicate a medical problem (Pan-Pan medico, repeated three times).

Securite

Securite (pronounced 'Securitay') (from French securité) indicates a message about safety, such as a hazard to navigation.

Silence

The following calls may be made only by the coastguard or the vessel in distress:

Seelonce Mayday or Seelonce Distress mean that the channel may only be used by the vessel in distress and the coastguard (and any other vessels they ask for assistance in handling the emergency). The channel may not be used for normal working traffic until 'seelonce feenee' is broadcast.

The expressions Stop Transmitting - Distress and Stop Transmitting - Mayday are the aeronautical equivalents of Seelonce Mayday.

Seelonce Feenee (French: silence fini - silence finished) means that the emergency situation has been concluded and the channel may now be used normally. The word prudonce (prudence caution) can also be used to allow restricted working to resume on that channel.

Distress Traffic Ended is the aeronautical equivalent of seelence feenee.

See also

call for help, SOS, distress signal, French phrases used by English speakers

External links

• Handling Distress and Help Calls
• Audio recording of Mayday call made from the Skyway Bridge Collapse, May 1980 (MP3 format)
• Boating Safety: A VHF Primer, the use and misuse of the VHF

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