Marine Radio revision module 3 of 10
Phonetic Alphabet & Prowords
Phonetic alphabet, numbers, vessel names, and standard radio words such as over, out, say again, and received.
7 guided lessons · 15 practice questions · 15 flashcards
3 outcomes · self-guided revision
- Explain phonetic alphabet, numbers, vessel names, and standard radio words such as over, out, say again, and received.
- Apply Phonetic alphabet to a realistic onboard situation.
- Recall the core check: use standard NATO phonetics.
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Lesson 1 of 7
Why Phonetics Matter
The phonetic alphabet makes vessel names, call signs, waypoints, and spellings clear in noise, weak signal, or stress.
Use phonetics when there is any chance of confusion. Practice your own vessel name and call sign until it is automatic.
- Use standard NATO phonetics
- Practice your vessel name
- Spell slowly and deliberately
Lesson 2 of 7
Numbers and Positions
Numbers should be spoken clearly and grouped sensibly. Coordinates and MMSI numbers must be repeated accurately because one wrong digit can change the meaning completely.
In an emergency, position must be given in a form rescuers can use: latitude and longitude, bearing and distance, or a clear local description.
- Speak digits one at a time when needed
- Repeat critical numbers
- Use a usable position format
Lesson 3 of 7
Useful Prowords
Prowords keep radio traffic short and unambiguous. Common examples include Over, Out, Say Again, Received, Correction, and Stand By.
Do not say Over and Out together. Over invites a reply; Out means the exchange is finished.
- Over means reply expected
- Out means finished
- Say Again asks for repetition
Lesson 4 of 7
Alpha To Zulu
The phonetic alphabet exists so letters remain clear through noise, accent, weak signal, and stress. It is not optional decoration in a difficult call; it is how you make names, call signs, waypoints, and spellings unambiguous.
Practice your vessel name, call sign, and home port until you can spell them without looking down. In an emergency, the radio operator should not be inventing phonetics.
- Use the standard NATO/ICAO phonetic words.
- Say 'I spell' before spelling a word if clarity is needed.
- Group long spellings and pause for readback.
- Use phonetics for vessel names, call signs, and confusing place names.
| A-F | G-L | M-R | S-X | Y-Z |
|---|---|---|---|---|
| Alpha | Golf | Mike | Sierra | Yankee |
| Bravo | Hotel | November | Tango | Zulu |
| Charlie | India | Oscar | Uniform | |
| Delta | Juliett | Papa | Victor | |
| Echo | Kilo | Quebec | Whiskey | |
| Foxtrot | Lima | Romeo | X-ray |
Lesson 5 of 7
Numbers And Critical Digits
Numbers need the same discipline as letters. MMSI, position, bearings, distances, times, and channels can all become unsafe if one digit is misheard.
The exam standard is to speak digits clearly and group them sensibly. Common radio pronunciations include Wun, Too, Tree, Fower, Fife, Six, Seven, Ait, Niner, Decimal, Hundred, and Thousand.
- Say critical numbers slowly.
- Repeat or request readback for MMSI, position, and channels.
- Use Decimal for a decimal point.
- Use Niner to avoid confusion with German nein or noisy line endings.
| Digit | Radio pronunciation | Why it matters |
|---|---|---|
| 1 | Wun | Keeps the digit short and clear |
| 3 | Tree | Avoids a soft th sound |
| 4 | Fower | Separates it from for |
| 5 | Fife | Separates it from fire/five in noise |
| 9 | Niner | Avoids confusion with no/nein |
| . | Decimal | Makes positions and frequencies clear |
Lesson 6 of 7
Prowords That Prevent Ambiguity
Prowords are short radio words with defined jobs. They reduce clutter and stop stations guessing what you mean.
The highest-value distinction is Over versus Out. Over invites a reply. Out ends the exchange. Saying both together is contradictory in standard procedure.
- Over: I have finished and expect a reply.
- Out: this exchange is finished; no reply expected.
- Say Again: repeat all or part of your last transmission.
- Correction: an error follows; the corrected version is next.
- Stand By: wait; I will call again.
Lesson 7 of 7
Readback And Correction
If a station gives a channel, position, time, or instruction, read back the critical part when appropriate. This catches errors before they become navigation or rescue problems.
If you make an error, do not talk around it. Say Correction, then give the corrected word, number, or phrase clearly.
- Read back critical digits and channel changes.
- Ask Say Again when any part is uncertain.
- Use Correction promptly after a spoken error.
- Keep spellings slow enough for the receiving station to write down.