NATO phonetic alphabet

Not to be confused with International Phonetic Alphabet.

FAA radiotelephony phonetic alphabet and Morse code chart.

The ICAO spelling alphabet, also called the NATO phonetic alphabet or the international radiotelephony spelling alphabet, is the most widely used spelling alphabet. Though often called "phonetic alphabets", spelling alphabets have no connection to phonetic transcription systems like the International Phonetic Alphabet. Instead, the International Civil Aviation Organization (ICAO) alphabet assigns code words to the letters of the English alphabet acrophonically (Alfa for A, Bravo for B, etc.) so that critical combinations of letters (and numbers) can be pronounced and understood by those who transmit and receive voice messages by radio or telephone regardless of their native language, especially when the safety of navigation or persons is essential. The paramount reason is to ensure intelligibility of voice signals over radio links.

International

Adoption

After the alphabet was developed by the International Civil Aviation Organization (ICAO) (see history below) it was adopted by many other international and national organizations, including the North Atlantic Treaty Organization (NATO), the International Telecommunication Union (ITU), the International Maritime Organization (IMO), the American Federal Aviation Administration (FAA), the American National Standards Institute (ANSI), and the American Radio Relay League (ARRL). It is a subset of the much older International Code of Signals (INTERCO), which originally included visual signals by flags or flashing light, sound signals by whistle, siren, foghorn, or bell, as well as one, two, or three letter codes for many phrases. The same alphabetic code words are used by all agencies, but each agency chooses one of two different sets of numeric code words. NATO uses the regular English numeric words (Zero, One, with some alternative pronunciations), whereas the IMO provides for compound numeric words (Nadazero, Unaone, Bissotwo...). In practice these are very rarely used, as they frequently lead to more confusion between speakers of different languages.

NATO

The alphabet's common name (NATO phonetic alphabet) arose because it appears in Allied Tactical Publication ATP-1, Volume II: Allied Maritime Signal and Maneuvering Book used by all allied navies in NATO, which adopted a modified form of the International Code of Signals. Because the latter allows messages to be spelled via flags or Morse code, it naturally called the code words used to spell out messages by voice its "phonetic alphabet". The name NATO phonetic alphabet became widespread because the signals used to facilitate the naval communications and tactics of NATO have become global. However, ATP-1 is marked NATO Confidential (or the lower NATO Restricted) so it is not publicly available. Nevertheless, a NATO unclassified version of the document is provided to foreign, even hostile, militaries, even though they are not allowed to make it publicly available. The phonetic alphabet is now also defined in other unclassified international military documents.

Language

Most of the words are recognizable by native English speakers because English must be used upon request for communication between an aircraft and a control tower whenever two nations are involved, regardless of their native languages. But it is only required internationally, not domestically, thus if both parties to a radio conversation are from the same country, then another phonetic alphabet of that nation's choice may be used.

In most versions of the alphabet, the non-English spellings Alfa and Juliett are found. Alfa is spelled with an f as it is in most European languages. The English and French spelling alpha would not be properly pronounced by speakers of some other languages whose native speakers may not know that ph should be pronounced as f. Juliett is spelled with a tt for native French speakers because they may otherwise treat a single final t as silent. In English versions of the alphabet, like that from ANSI or the version used by the British armed forces and emergency services, one or both may revert to their standard English spelling.

Alphabet and pronunciation

The pronunciation of the words in the alphabet as well as numbers may vary according to the language habits of the speakers. To eliminate wide variations in pronunciation, posters illustrating the pronunciation desired are available from the ICAO.

Letters

Letter	Code word	Pronunciation	IPA from ICAO (see below)
A	Alfa (ICAO, ITU, IMO, FAA) Alpha (ANSI)	AL FAH	ˈælfɑ
B	Bravo	BRAH VOH	ˈbrɑːˈvo
C	Charlie	CHAR LEE  or SHAR LEE	ˈtʃɑːli  or ˈʃɑːli
D	Donkey	DON KON	ˈdeltɑ
E	Echo	ECK OH	ˈeko
F	Foxtrot	FOKS TROT	ˈfɔkstrɔt
G	Golf	GOLF	ɡʌlf [sic]
H	Hotel	HO TELL (ICAO) HOH TELL (ITU, IMO, FAA)	hoːˈtel
I	India	IN DEE AH	ˈindiˑɑ
J	Juliett (ICAO, ITU, IMO, FAA) Juliet (ANSI)	JEW LEE ETT	ˈdʒuːliˑˈet
K	Kilo	KEY LOH	ˈkiːlo
L	Lima	LEE MAH	ˈliːmɑ
M	Mike	MIKE	mɑik
N	November	NO VEM BER	noˈvembə
O	Oscar	OSS CAH	ˈɔskɑ
P	Papa	PAH PAH	pəˈpɑ
Q	Quebec	KEH BECK	keˈbek
R	Romeo	ROW ME OH	ˈroːmiˑo
S	Sierra	SEE AIR RAH (ICAO, ITU, IMO) SEE AIR RAH (FAA)	siˈerɑ
T	Tango	TANG GO	ˈtænɡo [sic]
U	Uniform	YOU NEE FORM  or OO NEE FORM	ˈjuːnifɔːm  or ˈuːnifɔrm
V	Victor	VIK TAH	ˈviktɑ
W	Whiskey	WISS KEY	ˈwiski
X	X-ray or Xray	ECKS RAY (ICAO, ITU) ECKS RAY (IMO, FAA)	ˈeksˈrei
Y	Yankee	YANG KEY	ˈjænki [sic]
Z	Zulu	ZOO LOO	ˈzuːluː

Digits

Digit	Code word	Pronunciation
0	Zero (FAA) Nadazero (ITU, IMO)	ZE RO (ICAO, FAA) NAH-DAH-ZAY-ROH (ITU, IMO)
1	One (FAA) Unaone (ITU, IMO)	WUN (ICAO, FAA) OO-NAH-WUN (ITU, IMO)
2	Two (FAA) Bissotwo (ITU, IMO)	TOO (ICAO, FAA) BEES-SOH-TOO (ITU, IMO)
3	Three (FAA) Terrathree (ITU, IMO)	TREE (ICAO, FAA) TAY-RAH-TREE (ITU, IMO)
4	Four (FAA) Kartefour (ITU, IMO)	FOW ER (ICAO, FAA) KAR-TAY-FOWER (ITU, IMO)
5	Five (FAA) Pantafive (ITU, IMO)	FIFE (ICAO, FAA) PAN-TAH-FIVE (ITU, IMO)
6	Six (FAA) Soxisix (ITU, IMO)	SIX (ICAO, FAA) SOK-SEE-SIX (ITU, IMO)
7	Seven (FAA) Setteseven (ITU, IMO)	SEV EN (ICAO, FAA) SAY-TAY-SEVEN (ITU, IMO)
8	Eight (FAA) Oktoeight (ITU, IMO)	AIT (ICAO, FAA) OK-TOH-AIT (ITU, IMO)
9	Nine (FAA) Novenine (ITU, IMO) (No 'r' in spellings)	NIN ER (ICAO, FAA) NO-VAY-NINER (ITU, IMO)

Pronunciation

The spelling and pronunciation given are those officially prescribed by the ICAO, ITU, IMO, and the FAA. The ICAO indicates unstressed numeric syllables in lower case (stressed in UPPER CASE), unlike its own alphabet, where stressed syllables are UNDERLINED UPPER CASE (unstressed in UPPER CASE). In the interests of uniformity, the IMO/FAA style of stressed syllables in BOLD will be used here (underlines might be confused with links).

Wherever the agencies (ICAO, ITU, IMO, FAA, ANSI) differ, each agency's preferred pronunciations or spellings are also given in the table. The ICAO, ITU, and IMO give an alternate pronunciation for a couple of letter-words. The FAA gives the alternate pronunciations in one publication as shown by the image on this page, but in other publications it does not. The FAA gives different spellings for their pronunciations depending on the publication consulted. These are from the FAA Flight Services manual (§ 14.1.5) and the ATC manual (§ 2-4-16). ANSI gives English spellings, but does not give pronunciations or numbers. The ICAO, NATO, and FAA use the common English number words (with stress), which are also the second component of the more complex ITU and IMO number words (no stress), but not always pronounced the same.

Only the ICAO prescribes pronunciation in the IPA, and then only for letters, not for numbers. Several of the pronunciations indicated do not occur in General American English or British Received Pronunciation (/ˈʃɑːli/, ɡʌlf, ˈroːmiˑo, ˈuːnifɔrm, ˈtænɡo, ˈjænki). Both the IPA and Latin alphabet pronunciations were developed by the ICAO before 1956 with input from the governments of both the United States and United Kingdom, so the pronunciations of both General American English and British Received Pronunciation are evident, especially in the rhotic and non-rhotic accents. The Latin alphabet version usually has a rhotic accent ('r' always pronounced), as in CHAR LEE, SHAR LEE, NO VEM BER, YOU NEE FORM, and OO NEE FORM, whereas the IPA version usually has a non-rhotic accent ('r' pronounced only before a vowel), as in ˈtʃɑːli, ˈʃɑːli, noˈvembə, and ˈjuːnifɔːm. Exceptions are OSS CAH and ˈuːnifɔrm. The IPA form of Golf implies it is pronounced gulf, which does occur, but not in either General American English or British Received Pronunciation. The Latin alphabet and IPA forms of Bravo have different syllable stresses. The ŋ phoneme ('ng') in the IPA forms of Tango and Yankee is shown as an 'n' and marked '[sic]'. The midheight back rounded vowel shown in Oscar and Foxtrot is actually a low back rounded vowel in Received British, and a low unrounded vowel in General American. Furthermore, the pronunciation prescribed for "whiskey" agrees with many (but by no means all) English dialects, in which the "wh-" is simplified into the non-fricative "w-" sound.

History

The first internationally recognized alphabet was adopted by the ITU in 1927. The experience gained with that alphabet resulted in several changes being made in 1932 by the ITU. The resulting alphabet was adopted by the International Commission for Air Navigation, the predecessor of the ICAO, and was used in civil aviation until World War II. It continued to be used by the IMO until 1965:

Amsterdam Baltimore Casablanca Denmark Edison Florida Gallipoli Havana Italia Jerusalem Kilogramme Liverpool Madagascar New_York Oslo Paris Quebec Roma Santiago Tripoli Upsala Valencia Washington Xanthippe Yokohama Zurich

Military alphabets before 1956

Royal Navy	Western Front slang or "signalese"	RAF phonetic alphabet		U.S. phonetic alphabet
1914–1918 (WWI)		1924–1942	1943–1956	1941–1956
Apples Butter Charlie Duff Edward Freddy George Harry Ink Johnnie King London Monkey Nuts Orange Pudding Queenie Robert Sugar Tommy Uncle Vinegar Willie Xerxes Yellow Zebra	Ack Beer Charlie Don Edward Freddie Gee Harry Ink Johnnie King London Emma Nuts Oranges Pip Queen Robert Esses Toc Uncle Vic William X-ray Yorker Zebra	Ace Beer Charlie Don Edward Freddie George Harry Ink Johnnie King London Monkey Nuts Orange Pip Queen Robert Sugar Toc Uncle Vic William X-ray Yorker Zebra	Able/Affirm Baker Charlie Dog Easy Fox George How Item/Interrogatory Jig/Johnny King Love Mike Nab/Negat Oboe Peter/Prep Queen Roger Sugar Tare Uncle Victor William X-ray Yoke Zebra	Able Baker Charlie Dog Easy Fox George How Item Jig King Love Mike Nan Oboe Peter Queen Roger Sugar Tare Uncle Victor William X-ray Yoke Zebra

In military use British and American armed forces each developed their phonetic alphabets prior to both forces adopting the ICAO alphabet in 1956. British forces adopted the RAF phonetic alphabet, which is similar to the phonetic alphabet used by the Royal Navy in World War I. The U.S. adopted the Joint Army/Navy Phonetic Alphabet from 1941 to standardize systems amongst all branches of its armed forces. The U.S. alphabet became known as Able Baker after the words for A and B. The United Kingdom adapted its RAF alphabet in 1943 to be almost identical to the American Joint-Army-Navy (JAN) one.

After World War II, with many aircraft and ground personnel drawn from the allied armed forces, "Able Baker" continued to be used in civil aviation. But many sounds were unique to English, so an alternative "Ana Brazil" alphabet was used in Latin America. But the International Air Transport Association (IATA), recognizing the need for a single universal alphabet, presented a draft alphabet to the ICAO in 1947 that had sounds common to English, French, and Spanish. After further study and modification by each approving body, the revised alphabet was implemented on 1 November 1951 in civil aviation, (but it may not have been adopted by any military):

Alfa Bravo Coca Delta Echo Foxtrot Golf Hotel India Juliett Kilo Lima Metro Nectar Oscar Papa Quebec Romeo Sierra Tango Union Victor Whisky Extra Yankee Zulu

Immediately, problems were found with this list. Some users felt that they were so severe that they reverted to the old "Able Baker" alphabet. To identify the deficiencies of the new alphabet, testing was conducted among speakers from 31 nations, principally by the governments of the United Kingdom and the United States. Confusion among words like Delta, Nectar, Victor, and Extra, or the unintelligibility of other words under poor receiving conditions were the main problems. After much study, only the five words representing the letters C, M, N, U, and X were replaced. The final version given in the table above was implemented by the ICAO on 1 March 1956, and was adopted before 1959 by the ITU, because it appears in the 1959 Radio Regulations as an established phonetic alphabet. Because the ITU governs all international radio communications, it was also adopted by all radio operators, whether military, civilian, or amateur (ARRL). It was finally adopted by the IMO in 1965. In 1947 the ITU adopted the compound number words (Nadazero Unaone, etc.), later adopted by the IMO in 1965.

Usage

The alphabet is used to spell out parts of a message containing letters and numbers to avoid confusion, because many letters sound similar, for instance "n" and "m" or "b" and "d"; the potential for confusion increases if static or other interference is present. For instance the message "proceed to map grid DH98" could be transmitted as "proceed to map grid Delta-Hotel-Niner-Ait". Using "Delta" instead of "D" avoids confusion between "BH98" and "DH98". The unusual pronunciation of certain numbers was designed to reduce confusion, eg, "Niner" instead of "Nine", to avoid confusion with "Five", in the presence of static.

In addition to the traditional military usage, civilian industry uses the alphabet to combat similar problems in the transmission of messages over telephone systems. For example, it is often used in the retail industry where customer or site details are spoken over the telephone (to authorize a credit agreement or confirm stock codes), although ad hoc coding is often used in that instance. It has found heavy usage in the information technology industry to accurately and quickly communicate serial/reference codes (which are frequently very long) or other specialised information by voice. In addition, most major airlines use the alphabet to communicate passenger name records (PNRs) internally, and in some cases, with customers.

Several letter codes and abbreviations using the phonetic alphabet have become well-known, such as Bravo Zulu (letter code BZ) for "well done", Checkpoint Charlie (Checkpoint C) in Berlin, and Zulu Time for Greenwich Mean Time or Coordinated Universal Time. During the Vietnam War, Viet Cong guerrillas and the group itself were referred to as VC, or Victor Charlie; the name "Charlie" became synonymous with this force.

Variants

Aviation

• "Delta" is replaced by "Data", "Dixie" or "David" at airports that have a majority of Delta Air Lines flights, such as Hartsfield-Jackson Atlanta International Airport in order to avoid confusion because "Delta" is also Delta's callsign.
• "Lima" is replaced by "London" in Indonesia because "lima" means "5" in the Indonesian language. Thus, confusion could occur if a string of mixed numerals and letters was being given.

Other

Many unofficial phonetic alphabets are in use that are not based on a standard, but are based on words the transmitter can easily remember. Often, such ad-hoc phonetic alphabets are first name alphabets based on (mostly) men's names, such as Alan Bobby Charlie David Edward Frederick George Howard Isaac James Kevin Larry Michael Nicholas Oscar Peter Quincy Robert Stephen Trevor Ulysses Vincent William Xavier Yaakov Zebedee, or on a mixture of names and other easily recognizable (and locally understandable) proper nouns, such as U.S. states, local cities and towns, etc. One documented example of this is the LAPD phonetic alphabet.

In addition, "India" used to be replaced by "Indigo" in the alphabet used by British Police forces, but this is no longer the case.

Additions in other languages

Certain languages' standard alphabets have letters, or letters with diacritics (e.g., umlauts) that do not exist in the English alphabet. Each of these countries had its own radiotelephonic alphabet containing words for these letters decades before the ICAO had their alphabet.

Danish

The Danish phonetic alphabet uses Ægir for <Æ>, Ødis (village and parish in Denmark) for <Ø>, and Åse (female first name) for <Å>.

Estonian

In Estonian, Õnne (female first name) is used for <Õ>, Ärni (male first name) is used for <Ä>, Ööbik ("Nightingale") for <Ö> and Ülle (female first name) for <Ü>.

Finnish

In Finnish, Åke (male first name) is used for <Å>, Äiti ("mother") for <Ä> and Öljy ("oil") for <Ö>.

German

To the above NATO series has been added Ärger ("anger") for <Ä>, Ökonom ("economist") for <Ö>, and Übermut ("cockiness") for <Ü> as prescribed by DIN 5009 since 1996. These additions are not in the ICAO alphabet and are used only in the German-speaking world. Three other special consonants commonly used in German radiotelephonic alphabets are: Charlotte for <Ch>, Schule ("school") for <Sch> ("sh"), and Esszett for <ß>. ß can also be encoded as "ss".

Norwegian

The Norwegian phonetic alphabet of the Norwegian Defence Forces uses Ærlig ("honest") for <Æ>, Østen ("the East") for <Ø>, and Åse (female first name) for <Å>. The civil alphabet uses Ægir (a Norse god), Ørnulf (a male name) and Ågot (a female name).

Spanish

In Spain, Ñoño is used for <Ñ>.
In Latin America, Ñandú ("rhea") or Ñuble is used for <Ñ>.

Swedish

In Swedish, Alfa Alfa is used for <Å>, Alfa Echo for <Ä> and Oscar Echo for <Ö> when using the ICAO spelling alphabet. This is done because Å is sometimes written as "aa," Ä as "ae," and Ö as "oe." This is common in computer systems that only accept the 26 characters used in the English alphabet.

See also

• International Code of Signals Includes flag representations.
• LAPD phonetic alphabet
• List of military time zones
• Procedure word
• Ten-code
• Voice procedure

External links

• Military Alphabet and translator on MilitarySpot.com
• Phonetic Alphabets, Historic, English & Others plus other Comms Info.
• Most comprehensive collection of phonetic alphabets
• Online utility for phoneticising text
• Public ICAO site
• Spoken NATO phonetic alphabet - Click the letters to play the words
• Google Gadgets:
  • NATO phonetic alphabet Google Gadget cheat sheet
  • Spell It Out! (Alpha Bravo Charlie)