A VHF radio is one of the few bits of equipment on board that can change a developing problem very quickly. Used well, it helps you get clear information, speak to the right people, and call for help without delay. If you want to know how to use marine VHF properly, the aim is not just to memorise phrases. It is to stay calm, choose the right channel, and pass useful information first time.
Why good VHF use matters
On the water, poor radio use creates confusion far faster than people expect. A call that is too long, too vague or made on the wrong channel can block urgent traffic and delay a response. In busy areas such as the Solent, where commercial traffic, leisure craft, harbour authorities and marinas all share the airwaves, clear radio discipline matters.
That does not mean sounding formal for the sake of it. In practice, the best operators are usually the clearest and shortest. They know what they need to say before pressing the transmit button, and they understand when a call should go to the Coastguard, a marina, another vessel, or nobody at all.
How to use marine VHF before you leave the berth
A marine VHF should be part of your pre-departure routine, not something you think about only when you need it.
Start by checking that the set powers up properly and that the aerial connection is secure. Make sure the radio is on high enough volume to hear in the helm position, but not so loud that messages become distorted. If your set has DSC, confirm the MMSI is programmed correctly and that the GPS input is working so your position can be transmitted if needed.
You should also know which channels are likely to matter for the day ahead. That often includes Channel 16 for distress, urgency and initial calling, the local harbour or port working channel, and the channel used by your destination marina. Keep a note of them where they are easy to read.
A radio check may be sensible, but it should be done correctly. Do not use Channel 16 for a casual radio check. In many areas, a marina, harbour office or dedicated service may handle radio checks on an appropriate working channel. If no radio check is necessary, avoid making one just for reassurance.
The basic rules of speaking on VHF
Using VHF well is mostly about discipline.
Listen before transmitting. If the channel is busy, wait. Press the transmit button, pause for a second, then speak clearly. Hold the microphone a short distance from your mouth and speak across it rather than directly into it if wind or engine noise is a problem.
Keep calls brief and structured. Say who you are calling, who you are, where you are if relevant, and what you need. Then stop. Long, rambling calls often lead to repeat questions, which take more airtime than a tidy first message.
It also helps to remember that VHF is not a private conversation. Everyone listening to that channel can hear you. Professional, calm language is safer than chatty or rushed language, particularly if conditions are poor.
Which channels to use
Channel 16
Channel 16 is the international distress, safety and calling channel. It is used for Mayday, Pan Pan and Sécurité messages, and should be kept clear as much as possible. For routine contact, many DSC-equipped sets allow you to use an individual DSC call and move straight to an appropriate working channel, rather than making first contact on Channel 16.
Working channels
Routine traffic should usually take place on a marina, harbour, ship-to-ship or other allocated working channel. The exact channel depends on who you are speaking to and where you are operating. Good skippers check this in advance rather than searching in a hurry.
DSC functions
If your radio is DSC-equipped, it adds another layer of capability. A distress alert can send your vessel identity and, if connected, your position. That is useful, but it does not replace voice procedure. In a real emergency, a DSC distress alert should normally be followed by the appropriate voice distress call on Channel 16.
How to call another station
Routine calling follows a simple pattern. Call the station name up to three times, then your own vessel name once. For example: “Southampton Harbour Radio, Southampton Harbour Radio, Southampton Harbour Radio, this is Motorboat Example.”
If they reply, they may tell you to pass your message on that channel or change to another one. Read back the working channel if given. Once there, keep the message short and practical: your berth request, your lock arrival, your fuel query, your position, or your intention to pass.
This is where many people overcomplicate things. You do not need theatrical radio language. You do need accuracy. Harbour staff and marina teams usually want the same essentials every time: who you are, where you are, what you want, and any detail that affects safe movement.
How to use marine VHF in an emergency
The level of urgency matters. Not every problem is a Mayday.
Mayday
Use Mayday when there is grave and imminent danger to a vessel or person, such as fire, sinking, man overboard in serious conditions, or a medical emergency where immediate assistance is required.
A standard Mayday call includes:
- “Mayday, Mayday, Mayday”
- Vessel name and call sign or MMSI if needed
- Position
- Nature of distress
- Assistance required
- Number of people on board
- Any other useful information, such as life raft launched or abandoning to the water
The order matters less than getting the critical facts out clearly. Position is especially important. If the Coastguard cannot establish where you are, the rest of the message is much less useful.
Pan Pan
Use Pan Pan for urgent situations that are serious but not immediately life-threatening. Common examples include breakdown in a shipping channel, loss of steering, or a medical issue that needs advice but is not yet critical.
Sécurité
Sécurité is for important navigational or weather safety information. Most leisure boaters will hear this more often than they will transmit it, but it is worth recognising.
Practical examples afloat
A routine marina call might be straightforward. You are approaching and need a visitor berth. The marina needs your boat name, length, approximate arrival time and perhaps whether you require fuel. A short, clean exchange saves time for everyone.
A harbour movement call can be more safety-critical. If visibility is poor or traffic is heavy, your position, direction of travel and intentions matter much more than small details about your destination. In these moments, radio use supports boat handling. It does not replace it.
Mechanical failure is where judgement becomes important. An engine problem outside a quiet anchorage may be inconvenient but manageable. The same failure near a lee shore, in strong tide, or in the path of commercial traffic can become urgent very quickly. The correct radio call depends on the real risk, not the fault itself.
Common mistakes to avoid
The most common mistake is talking too much. The second is calling on the wrong channel. After that comes failing to prepare the message before pressing transmit.
Other regular problems include using Channel 16 for non-urgent conversation, making radio checks where they are not appropriate, forgetting to release the transmit button, and speaking so fast that key details are lost.
There is also a human factor. People often become less clear when they are embarrassed, stressed or worried about sounding inexperienced. In reality, a plain message delivered slowly is far more effective than a polished one delivered badly.
Training makes a real difference
Radio procedure is much easier when you have practised it aloud. Reading distress formats from a handbook is useful, but it is not the same as speaking into a microphone while managing a boat, crew and situation. That is why formal VHF training remains valuable even for capable boat handlers.
For many skippers, the biggest gain is confidence rather than theory. Once you have used a set properly, understood the channels, and practised emergency calls, the radio becomes a working tool rather than a source of hesitation. That matters on coastal passages, during marina arrivals, and especially when plans start to change.
Keep the set ready, keep your calls short, and think before you transmit. When the moment comes, that calm, structured habit is what really counts.