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Every year, miscommunication over the radio at sea leads to dangerous situations — from a misheard mooring command to confusion during a search-and-rescue operation. To make sure sailors of different nationalities understand each other unambiguously, the International Maritime Organization (IMO) developed the Standard Marine Communication Phrases — SMCP. Here’s what SMCP is and how to master it faster.
What is SMCP
SMCP is a standardized set of English-language phrases adopted by the IMO in 2001, replacing the outdated Standard Marine Navigational Vocabulary. Its purpose is to minimize ambiguity in radio communication and make it easier for crews to understand each other when English is not their native language. Every phrase has a fixed structure, so there’s no need to improvise — you simply pick the right template for the situation.
Main sections of SMCP
- General phrases — requests to repeat, confirm, spell out, and indicate message urgency.
- External communication — navigational safety, manoeuvring, cargo handling, pilotage.
- On-board communication — bridge, engine room, and mooring operation commands.
- Emergency phrases — distress, fire, flooding, and abandon-ship messages.
Examples of common phrases
Here are a few basic constructions that are a good starting point:
- “Say again” — please repeat your message.
- “I say again…” — repeating my message.
- “This is not correct. The correct version is…” — used to correct a misunderstanding.
- “Mayday, Mayday, Mayday” — distress signal, immediate danger to life.
- “Pan-pan, Pan-pan, Pan-pan” — urgency signal, no immediate danger to life.
How to learn SMCP effectively
- Start with the General section — these phrases are used most often and form the basis of every other section.
- Practise the phrases out loud, not just on paper — radio communication requires automatic, confident pronunciation.
- Listen to real VHF recordings to get used to the pace and accents you’ll actually encounter at sea.
- Practise regularly through dialogue drills on a maritime English course — rote memorisation without practice is quickly forgotten.
Conclusion
Knowing SMCP isn’t just a box to tick for an exam — it’s a genuine safety tool on board. The more confidently a sailor uses these standard phrases, the lower the risk of a critical misunderstanding in a difficult situation. At Sea Service, we build SMCP practice into our MARLINS and CES test preparation programmes — join a course to put these phrases into practice.