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The International Radiotelephony Spelling Alphabet, commonly known as the NATO phonetic alphabet, is a set of code words used to clearly communicate the letters of the Roman alphabet over VHF marine radio. It plays a key role in avoiding miscommunication when conveying vital information to search and rescue in the event of an emergency.
It is commonly used by boaters in Canada to spell out words in a structured, predetermined manner.
Example: Boat would be spelled Bravo-Oscar-Alpha-Tango. Each letter is indicated by a specific word to avoid confusion.
The code was devised through the collaboration of several international agencies to make sure that letters can be easily distinguished from each other despite language barriers, differences in pronunciation and issues related to poor-quality transmission.
Key takeaways
- The NATO phonetic alphabet is an internationally recognized way to communicate on radio.
- It consists of specific complete words for each letter, which are used to avoid confusion and misunderstanding.
- Canadian recreational boaters should use the NATO alphabet when in distress or in poor communication situations to spell out important information like names, locations, and licence/permit/registration information.
- NATO alphabet flags can also be used, alone or in specific combinations, though this is less common (other than Alpha and Oscar flags).
Table of contents
- Code Words of the NATO Phonetic Alphabet (Letters)
- Code words of the NATO phonetic alphabet (numbers)
- NATO Alphabet Flags
- Single-Flag Signals
- Multi-Flag Signals
- 6 Situations Where You Should Use the NATO Phonetic Alphabet
- 1. Identifying your vessel
- 2. Relaying vital coordinates
- 3. During poor signal conditions
- 4. Spelling technical terms or locations
- 5. Transmitting Hull Identification Numbers (HIN) or PCL numbers
- 6. Spelling out names of people or places
- Frequently Asked Questions
Code Words of the NATO Phonetic Alphabet (Letters)
| Letter | Corresponding Word | Letter | Corresponding Word |
| A | Alfa | N | November |
| B | Bravo | O | Oscar |
| C | Charlie | P | Papa |
| D | Delta | Q | Quebec |
| E | Echo | R | Romeo |
| F | Foxtrot | S | Sierra |
| G | Golf | T | Tango |
| H | Hotel | U | Uniform |
| I | India | V | Victor |
| J | Juliett | W | Whiskey |
| K | Kilo | X | Xray |
| L | Lima | Y | Yankee |
| M | Mike | Z | Zulu |
Code words of the NATO phonetic alphabet (numbers)
| Number | NATO Alphabet Pronunciation |
| 0 | ZEE-roh |
| 1 | WUN |
| 2 | TOO |
| 3 | TREE |
| 4 | FOW-er |
| 5 | FIFE |
| 6 | SIX |
| 7 | SEV-en |
| 8 | AIT |
| 9 | NINER |
NATO Alphabet Flags
Each flag corresponds to a letter (and its phonetic name like Alpha, Bravo, etc.), but they aren’t just for spelling. They act as a visual shorthand for urgent messages that can be seen from a distance, even if your radio is dead.
The average recreational boater will most likely use only the Alpha flag or the Oscar flag.
Single-Flag Signals
Each flag has a specific, standalone meaning that tells other boats exactly what you are doing or what you need.
| Flag | Phonetic Name | Meaning When Flown Alone |
| A | Alpha | A type of diving flag which signals diver down; keep well clear at slow speed. |
| B | Bravo | I am taking in, discharging, or carrying dangerous cargo. |
| O | Oscar | Man overboard! |
| Q | Quebec | I request customs clearance for a boat in good condition. |
| V | Victor | I require assistance (non-distress). |
| W | Whiskey | I require medical assistance. |
Multi-Flag Signals
By hoisting two or more flags in a vertical line, vessels can send complex messages without saying a word.
The most famous combination is N over C, which is the international signal for I am in distress and require immediate assistance.
J over L warns another vessel they are at risk of running aground.
6 Situations Where You Should Use the NATO Phonetic Alphabet
Using the phonetic alphabet allows for fast and efficient communication, which is vital in emergencies (insert link to /boating-emergencies/).
You should use the NATO phonetic alphabet whenever there is a risk of a message being misunderstood, particularly over VHF radio where static, engine noise, and wind can get in the way of clear communication out on the water.
1. Identifying your vessel
There are many situations where you will need to clearly state the name of your boat. Many boat names sound similar, and using the phonetic alphabet will help avoid mistakes.
2. Relaying vital coordinates
If you are in distress, reporting a hazard or trying to avoid a collision, accuracy is non-negotiable. Use the phonetic alphabet for indicating latitude and longitude (for both numbers and letters) and when communicating a direction (north, south, east, west).
3. During poor signal conditions
Radio signals are rarely crystal clear. Use phonetics when there is heavy atmospheric interference (static), when you are at the edge of your radio’s range, or if the person on the other end speaks with a different accent from your own.
4. Spelling technical terms or locations
If you are describing a specific mechanical part that has failed or a local landmark that isn’t on a standard chart, spell it out so that the dispatcher or rescuer knows exactly what you are talking about.
5. Transmitting Hull Identification Numbers (HIN) or PCL numbers
Canadian boats require an HIN and sometimes Pleasure Craft Licence numbers, which are both a mix of numbers and letters. You can use the phonetic alphabet to communicate it to law enforcement or any other party.
6. Spelling out names of people or places
If you need to communicate the name of a location or a person, use the phonetic alphabet to avoid misunderstandings.
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Frequently Asked Questions
Strictly speaking, yes. While you might hear people use “Apple” or “Baker” in casual conversation, the NATO words (Alpha, Bravo, etc.) were scientifically chosen to be distinguishable even through heavy static and by non-native English speakers. Using non-standard words can cause confusion during an emergency.
In maritime and aviation communication, certain numbers are tweaked to avoid being mistaken for other words.
For example:
- 3 (Tree): To avoid sounding like free
- 5 (Fife): To avoid sounding like fire
- 9 (Niner): To avoid sounding like nine, which is German for no
No. Only use the phonetic alphabet for the most important and challenging elements, like names, coordinates, or any words the other person has difficulty understanding (especially if they ask you to repeat).
Yes. To let the other person know you are about to spell something, it is common practice to start with “I spell” or “spelled as”.
Example: “My vessel name is Aura, I spell: Alpha-Uniform-Romeo-Alpha.”
While memorizing the phonetic alphabet makes it easier to use, you can also keep a printed cheat sheet next to your radio. But keep in mind that during an emergency you may not be able to access your cheat sheet.
Sources
- NATO-OTAN NATO phonetic alphabet, codes and signals Articles. https://www.nato.int/en/news-and-events/articles/news/2017/12/21/nato-phonetic-alphabet-codes-and-signals
- NATO phonetic alphabet. (2026, March 6). In Wikipedia. https://en.wikipedia.org/wiki/NATO_phonetic_alphabet
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