Examples
According to theThis is ...
This transmission is from the station whose designator immediately follows. For clarity, the station ''called'' should be named before the station ''calling''. So, "Victor Juliet zero, THIS IS Golf Mike Oscar three..." or for brevity, "Victor Juliet zero, Golf Mike Oscar three, ROGER, OUT". Never "This is GMO3 calling VJ0", "This is ground control to Major Tom" nor any other reversed combination.Over
"This is the end of my transmission to you and a response ''is'' necessary. Go ahead: transmit." "Over" and "Out" are ''never'' used at the same time, since their meanings are mutually exclusive. With spring-loaded Push to talk (PTT) buttons on modern combined transceivers, the same meaning can be communicated with just "OUT", as in "Ops, Alpha, ETA five minutes. OUT."Out
"This is the end of my transmission to you and no answer is required or expected."Do you read?
A question about whether the receiver can hear and understand the transmission. Example: "Bob, you read me? What is the situation from your position?" Example:Roger
"I have received your last transmission satisfactorily,Wilco
"I understand and will comply." It is used on receipt of an order. "Roger" and "Wilco" used together (e.g. "Roger, Wilco") are redundant, since "Wilco" includes the acknowledgement element of "Roger".Say again
"I have not understood your message, please SAY AGAIN". Usually used with prowords "ALL AFTER" or "ALL BEFORE". Example: radio working between Solent Coastguard and a motor vessel, call-sign EG 93, where part of the initial transmission is unintelligible. Example: At this juncture, Solent Coastguard would reply, giving the position of the shipping vessel preceded with the prowords "I SAY AGAIN": The word "REPEAT" should not be used in place of "SAY AGAIN", especially in the vicinity of naval or other firing ranges, as "REPEAT" is an artillery proword defined in ACP 125 U.S. Supp-2(A) with the wholly different meaning of "request for the same volume of fire to be fired again with or without corrections or changes" (e.g., at the same coordinates as the previous round).All after...
"Please repeat the message you just sent me beginning after the word or phrase said after this proword."All before...
"Please repeat the message you just sent me ending before the word or phrase said after this proword."Wait over
"I must pause for a few seconds."Wait out
"I must pause for longer than a few seconds. I will call you back."Read back
"Please repeat my entire transmission back to me."I read back
"The following is my response to your READ BACK proword."Correction
"I made an error in this transmission. Transmission will continue with the last word correctly sent."Radio check
"What is my signal strength and readability; how do you hear me?" The sender requests a response indicating the strength and readability of their transmission, according to plain language radio check standards: * A response of ROGER is shorthand for the prowords LOUD AND CLEAR. * A response of WEAK BUT READABLE ("WEAK READABLE" is also used) indicates a weak signal but I can understand. * A response of WEAK AND DISTORTED indicates a weak signal and unreadable. * A response of STRONG BUT DISTORTED indicates a strong signal but unreadable. One of the two stations might be slightly off frequency, there might be multipath distortion, or there might be a problem with the audio circuits on one or both of the radios. "5 by 5" is an older term used to assess radio signals, as in 5 out of 5 units for both signal strength and readability. Other terms similar to 5x5 are "LOUD AND CLEAR" or "Lima and Charlie". Example: Similar example in shorter form: If the initiating station (Alpha 12 in the example) cannot hear the responding station (X-ray 23 above), then the initiator attempts a radio-check again, or if the responder's signal was not heard, the initiator replies to the responder with "Negative contact, Alpha 12 OUT". The following readability scale is used: 1 = bad (unreadable); 2 = poor (readable now and then); 3 = fair (readable, but with difficulty); 4 = good (readable); 5 = excellent (perfectly readable). Example of correct US Army radio check, for receiver A-11 (Alpha 11) and sender D-12 (Delta 12):Article 32 Radio Regulations distress and rescue
International Telecommunication Union (ITU) Radio Regulations and theMayday
Mayday is used internationally as the official SOS/distress call for voice. It means that the caller, their vessel or a person aboard the vessel is in grave and imminent danger, send immediate assistance. This call takes priority over all other calls. The correct format for a Mayday call is as follows:'' he first part of the signal is known as the "call"'VHF instructors, specifically those working for the Royal Yachting Association, often suggest the
Mayday, Mayday, Mayday,
This is (vessel name repeated three times, followed bycall sign In broadcasting and radio communications, a call sign (also known as a call name or call letters—and historically as a call signal—or abbreviated as a call) is a unique identifier for a transmitter station. A call sign can be formally ass ...if available)
he subsequent part of the signal is known as the "message" Mayday (vessel name)
My position is (position as a lat-long position or bearing and distance from a fixed point)
I am (type of distress, e.g. on fire and sinking)
I require immediate assistance
I have (number of people on board and their condition)
(Any other information e.g. "I am abandoning to life rafts")
Over
irst part of the messageMayday, Mayday, MaydayFor example: "Mayday, Mayday, Mayday, Wiki Air 999, we have lost both of our engines due to a bird strike, we are gliding now." After that pilot can give, or the controller can ask for, additional information, such as, fuel and number of passengers on board.
econd part of the messageCallsign
hird part of the messageNature of the emergency
Pan-Pan
Pan-pan (pronounced ) is the official urgency voice call. Meaning "I, my vessel or a person aboard my vessel requires assistance but is not in distress." This overrides all but a mayday call, and is used, as an example, for calling for medical assistance or if the station has no means of propulsion. The correct usage is:Pan-Pan, Pan-Pan, Pan-Pan
All stations, all stations, all stations
This is essel name repeated three timesbr> My position is osition as a lat-long position or bearing and distance from a fixed pointbr> I am ype of urgency, e.g. drifting without power in a shipping lanebr> I require ype of assistance requiredbr>ny other information e.g. size of vessel, which may be important for towing NY most commonly refers to: * New York (state), a state in the Northeastern United States * New York City, the most populous city in the United States, located in the state of New York NY, Ny or ny may also refer to: Places * North Yorkshir ...br> Over
SÉCURITÉ
Pronounced , this is the official safety voice call. "I have important meteorological, navigational or safety information to pass on." This call is normally broadcast on a defined channel (channel 16 for maritime VHF) and then moved onto another channel to pass the message. Example:n channel 16 SÉCURITÉ, SÉCURITÉ, SÉCURITÉ All stations, all stations, all stations. This is Echo Golf niner three, Echo Golf niner three, Echo Golf niner three. For urgent navigational warning, listen on channel six-seven. OUT hen on channel 67 SÉCURITÉ, SÉCURITÉ, SÉCURITÉ All stations, all stations, all stations. This is Echo Golf niner tree (three), Echo Golf niner tree, Echo Golf niner tree. Floating debris sighted off Calshot Spit. Considered a danger to surface navigation. OUT
SEELONCE MAYDAY
"Seelonce" is an approximation rendition of the French word ''silence''. Indicates that your vessel has an emergency and that you are requiring radio silence from all other stations not assisting you.SEELONCE DISTRESS
Indicates that you are relaying or assisting a station that has placed a MAYDAY call and you are requiring radio silence from all other stations not assisting you or the station in distress. When the emergency issue is winding down and then has been resolved, these prowords are used to open up the frequency for use by stations not involved in the emergency:PRU-DONCE
Indicates that complete radio silence is no longer required and restricted (limited) use of the frequency may resume, but immediately giving way to all further distress communications.SEELONCE FEENEE
Indicates that emergency communications have ceased and normal use of the frequency may resume.ACP 125(F)
Aviation radio
More formally known as "Aeronautical Mobile communications", radio communications from and to aircraft are governed by rules created by theMarine radio
Marine radio procedure words follow from the ACP-125 definition, and those in the International Radio Regulations published by theSMCP
* "Yes" when the answer to a question is in the affirmative * "No" when the answer to a question is in the negative * "Stand by" when the information requested is not immediately available * "No information" when the information requested cannot be obtainedMisusages
Clear
"Clear" is sometimes heard inAffirmative
"Confirm" or "yes" and sometimes shortened to ''Affirm'' is heard in several radio services, but is not listed in ACP-125 as a proword because in poor radio conditions it can be confused with ''Negative''. Instead, the proword ''Correct'' is used.Negative
Means "no", and can be abbreviated to ''Negat''. Because over a poor quality connection the words "affirmative" and "negative" can be mistaken for one another (for example over aExample of usage
Example 1
Two helicopters, call signs "Swiss 610" and "Swiss 613", are flying in formation : :Swiss 610: "613, I have a visual on you at my 3 o'clock. 610" :Swiss 613: "Roger 613" :Swiss 610: "613, Turn right to a heading of 090. 610" :Swiss 613: "Wilco 613" Anytime a radio call is made (excepting "standby", where the correct response is silence), there is some kind of response indicating that the original call was heard. 613's "Roger" confirms to 610 that the information was heard. In the second radio call from 610, direction was given. 613's "Wilco" means "will comply." Reading back an instruction confirms that it was heard correctly. For example, if all 613 says is "Wilco", 610 cannot be certain that he correctly heard the heading as 090. If 613 replies with a read back ''and'' the word "Wilco" ("Turn right zero-niner-zero, Wilco") then 610 knows that the heading was correctly understood, and that 613 intends to comply.Example 2
The following is the example of working between two stations, EG93 and VJ50 demonstrating how to confirm information: :EG93: "Victor Juliet five zero, Victor Juliet five zero, this is Echo Golf niner three. Request rendezvous at 51 degrees 37.0N, 001 degrees 49.5W. Read back for check. Over" :VJ50: "Echo Golf niner three, this is Victor Juliet five zero. I read back: five one degrees three seven decimal zero north, zero zero one degrees four niner decimal five west. Over." :EG93: "Victor Juliet five zero, this is Echo Golf niner three. Correct, Out"See also
*References
Notes
Bibliography