Why VHF Radio Skills Matter
A marine VHF radio is your primary communication tool on the water. Cell phones work close to shore but lose signal beyond a few miles; satellite phones and EPIRBs are emergency-only devices. VHF is the only communication system that lets you talk to the Coast Guard, other boaters, marinas, bridges, locks, and commercial traffic in real time during normal operation and in emergencies.
Using it properly means understanding channel assignments, following radio protocol, and knowing the procedures for distress, urgency, and safety calls. Poor radio etiquette isn't just annoying — it can block emergency communications and delay rescues. The good news is that marine radio procedure is straightforward once you learn the basics, and the Coast Guard publishes the rules clearly.
Key Channel Assignments
Channel 16 (156.800 MHz) is the international hailing and distress channel. Monitor it whenever you're on the water. Use it to make initial contact with another station, then agree to switch to a working channel for the conversation. Never use Channel 16 for extended conversations, weather checks, or casual chat — it needs to remain clear for emergencies.
Channel 9 is the secondary calling channel in some areas, used to reduce traffic on Channel 16. Channels 68, 69, 71, 72, and 78A are designated recreational working channels — switch to one of these after making contact on 16. Channel 22A is the Coast Guard liaison channel used for non-emergency communication with the Coast Guard after initial contact on 16. Channel 13 is the bridge-to-bridge navigation channel used by commercial traffic, tugs, and any vessel communicating about navigation in confined waterways. Recreational boaters can monitor and use Channel 13 when navigating near commercial traffic.
Making a Radio Call
The standard hailing procedure on Channel 16 is brief and structured: state the name of the station you're calling (three times if needed for clarity), then "this is" followed by your vessel name (twice), then "over." Wait for a response. If no response after 30 seconds, repeat once. After contact, agree on a working channel: "Switch to channel 68" — and both parties move to that channel for the conversation.
Keep transmissions short and clear. Use plain language rather than jargon — "I am heading north in the main channel" is better than trying to sound like a Navy radio operator. End each transmission with "over" (I'm done talking, your turn) or "out" (conversation is finished, no response expected). Never say "over and out" — it's contradictory and marks you as someone who learned radio procedure from movies.
Distress Procedures
Mayday (Immediate Danger to Life)
A Mayday call is reserved for situations where there is grave and imminent danger to a person or vessel and immediate assistance is required. Sinking, fire, man overboard in dangerous conditions, and medical emergencies requiring evacuation all qualify. The format is specific: "Mayday, Mayday, Mayday. This is [vessel name, three times]. Mayday, [vessel name]. My position is [latitude/longitude or description]. I am [nature of distress]. I require [type of assistance]. [Number of persons aboard]. [Description of vessel]. Over."
If you hear a Mayday and the Coast Guard hasn't responded within a minute or two, relay the call yourself. Every vessel has a legal obligation to render assistance to those in distress when it's safe to do so.
Pan-Pan (Urgent but Not Life-Threatening)
Pan-Pan covers situations that are serious but not immediately life-threatening — engine failure in a busy channel, a non-critical medical situation, or a boat taking on water that can be managed with pumps. The format follows the same structure as Mayday but begins with "Pan-Pan, Pan-Pan, Pan-Pan" and describes an urgent situation rather than a life-threatening one.
Sécurité Calls and Navigation Safety
Sécurité (pronounced "say-cure-ih-tay") is the third priority signal after Mayday and Pan-Pan. It announces navigation safety information — hazards to navigation, severe weather warnings, and other information that affects safe passage. The Coast Guard broadcasts Sécurité messages for things like unlit buoys, floating debris, loss of aids to navigation, and weather deterioration.
Recreational boaters can broadcast Sécurité messages when they encounter hazards that other vessels need to know about. A large submerged log in a channel, a missing channel marker, or a capsized vessel creating a navigation hazard are all appropriate Sécurité topics. The format begins with "Sécurité, Sécurité, Sécurité — all stations, this is [vessel name]" followed by the hazard description and location. Broadcast on Channel 16, then repeat on Channel 22A if the hazard is in a Coast Guard sector.
DSC: Digital Selective Calling
Most modern VHF radios include DSC capability, which allows digital distress calling at the push of a button. When activated, a DSC distress alert automatically transmits your MMSI number (which identifies your vessel) and GPS position to the Coast Guard and all DSC-equipped vessels within range. It's faster and more reliable than a voice Mayday because it doesn't depend on someone monitoring Channel 16 at exactly the right moment.
To use DSC, you need to register for an MMSI number (free, through BoatUS or the FCC) and connect your VHF radio to a GPS source. Once registered and connected, the DSC distress button becomes a one-press emergency notification system that works even if you're incapacitated and can't make a voice call.
A few radio maintenance notes: test your VHF radio before every trip by monitoring Channel 16 and confirming you hear traffic or weather broadcasts. If the radio receives but won't transmit, the antenna connection is the first suspect — corrosion on the coax connector at the antenna or at the radio reduces signal strength and can prevent transmission entirely. Inspect and clean the antenna connections annually, applying dielectric grease to prevent future corrosion. Carry a handheld VHF as a backup — if your fixed-mount radio fails, a handheld provides the ability to make distress calls and communicate with other vessels.
Frequently Asked Questions
What channel should I use to talk to other boats?
Channel 16 is the hailing and distress channel — use it to make initial contact, then switch to a working channel (68, 69, 71, 72, or 78A are common recreational channels). Never use Channel 16 for extended conversations — it needs to stay clear for emergencies and hailing.
Do I need a license for a marine VHF radio?
In US waters, recreational boaters do not need a license to operate a marine VHF radio. Commercial operators, vessels traveling internationally, and anyone using an SSB (single sideband) radio do need a license. However, registering your radio's DSC MMSI number is strongly recommended — it enables digital distress calling that transmits your identity and GPS position automatically.
What's the difference between a Mayday and a Pan-Pan?
Mayday is for immediate, life-threatening danger — sinking, fire, man overboard in hazardous conditions. Pan-Pan (pronounced 'pahn-pahn') is for urgent situations that are not immediately life-threatening — mechanical failure, medical situation requiring assistance, or losing your way in deteriorating conditions. Using the wrong one wastes resources or delays the response you need.