Phonetic Alphabet & Prowords

The CEPT SRC syllabus requires knowledge of the phonetic alphabet and awareness of the IMO Standard Marine Communication Phrases. The IMO instruction is direct: when spelling is necessary, only its standard spelling table should be used. A familiar word such as Apple or Able may sound clear to you but does not give the receiving station the shared international reference it expects.

Spell vessel names, call signs, unfamiliar place names or letter groups when they may be misunderstood. Prepare your own vessel name and call sign before transmitting so you can give them at a steady pace without hunting for a card halfway through the call.

Phonetics clarify letters; they do not replace the rest of the message. The receiving station still needs the correct identity, position, request and priority. If a critical detail remains uncertain, ask for repetition or confirmation instead of assuming what was said.

IMO SMCP says numbers are normally spoken as separate digits: 150 becomes one-five-zero. It also documents two decimal five and two point five for 2.5. A special published procedure can create an exception—for example, wheel orders use fifteen or twenty—so do not turn the separate-digit habit into an invented universal rule.

For latitude and longitude, give degrees and minutes, add decimals of a minute if needed, then state North or South and East or West. The directional letters are not optional: the same numbers with a different hemisphere describe another position.

A position relative to a mark must name a well-defined charted object. Quote the position's true bearing from that mark in 360-degree notation, then the distance and unit. Saying only 'near the lighthouse' leaves the receiver to guess both direction and scale.

Use Over when your transmission is complete and you expect the other station to reply. Use Out when the exchange is complete and no reply is expected. Combining them as 'Over and Out' gives contradictory instructions.

Say Again asks for all or part of a message to be repeated because it was not properly heard. Stand By means the requested information is not immediately available; IMO SMCP says to follow it with the time interval within which the information will be available.

Correction repairs your own spoken error. The IMO sequence says Mistake, then Correction, then the corrected part. Acknowledging or receiving a message is not the same as promising that you will comply with an instruction; the response must match the actual question or request.

Learn the alphabet as paired letters and code words, not as a chant detached from a task. Retrieval becomes more useful when you practice real vessel names, call signs and awkward letter groups in both directions: letter to word and word back to letter.

The official forms matter because the table is shared. Alfa is not Alpha, Juliet is not Juliett, and Whisky is not Whiskey in the IMO document. Correcting those details prevents the lesson itself from becoming the source of a later error.

Accuracy comes before speed. Leave a short pause between code words and a clearer break between separate words. If the receiving station remains unsure, repeat the requested group rather than racing through the whole sequence again.

The modified forms are an aid to intelligibility, not a licence to change the number. Work from the written value, speak one digit at a time and keep the original order. A nine-digit MMSI must remain nine digits from the first group to the last.

IMO also prints TOUSAND for 1000. For 2.5, its numbers section shows both two decimal five and two point five. This module uses decimal in drills because it is distinctive, while recognising the other documented form.

Pair every number with its meaning. One-six might be a channel, but the receiver should not have to infer that. State Channel one-six, bearing one-three-seven degrees or distance two decimal four nautical miles as appropriate.

Over and Out manage turn-taking. Say Again manages a reception failure. Stand By manages a short delay while information is obtained. Mistake and Correction repair your own message. These jobs are related, but they are not interchangeable.

The MCA examples show Over at the end of calls that invite a response and Out at the end of an all-stations urgency announcement before moving to the nominated working channel. The word must fit the real procedure and the next expected action.

A procedure word cannot make uncertain information true. If a position, time or instruction remains unclear, repeat or verify the detail. Do not use Received as a blanket substitute for a full response where an instruction or advice needs an explicit will, can, will not or cannot answer.

IMO SMCP says a sufficiently important part of a message can be safeguarded by saying Repeat and giving that part again. This is not a claim that every routine sentence needs a full readback; follow the applicable procedure and concentrate verification on identity, position, channel, time, instruction or other critical data.

If you did not properly hear another station, use Say Again. If you made the mistake, say Mistake, then Correction, then the corrected part. Those two paths keep the source of the error clear.

After a correction, release PTT and listen. The receiving station may still need to repeat or confirm the changed group. A clean correction reduces ambiguity but does not prove that the final value was received.