The first time a crew says a distress call aloud should not be during smoke, flooding or a medical emergency. Practice the words, radio controls and information flow without making a false transmission.
Understand the levels of urgency
Mayday is used for grave and imminent danger requiring immediate assistance. Pan-Pan communicates urgency involving safety without the same immediate distress level. Sécurité announces important safety information. Use current official guidance and local procedures.
When uncertain during a real emergency, state the facts plainly. The radio operator or rescue authority can help structure the exchange. Do not delay a serious call while trying to produce perfect phrasing.
Build a radio information card
Post the vessel name, description, registration or documentation details, MMSI, normal operating area, emergency contacts and radio call information near the set. Leave spaces for current position, persons aboard and nature of distress.
Every capable crew member should know where the card is, how to power the radio, select the distress channel, adjust volume and squelch, and use the microphone. A radio hidden behind unfamiliar menus is not crew-ready.
Practice without transmitting
Use a written scenario and conduct the drill with the radio off, microphone disconnected when appropriate, or a clearly non-transmitting training method. Never press the DSC distress button or broadcast a false emergency call.
One person plays the operator and another records missing information. Practice stating Mayday three times, vessel identification, position, nature of distress, assistance needed, persons aboard and other useful details, followed by listening for response.
Prepare DSC correctly
Digital Selective Calling can transmit an alert and identity when the radio has a valid MMSI and position source. Verify registration, programming and GPS connection according to current rules and equipment instructions.
Know how to cancel an accidental alert using the official procedure. Do not test the distress button casually. Use approved radio-check or DSC test functions where supported and lawful.
Make position easy to communicate
Practice reading latitude and longitude from the chartplotter and describing a position relative to a known landmark, channel marker or waterway. Confirm the coordinate format displayed and avoid transposing digits.
If electronics fail, the crew should still be able to give the last known position, route, direction of travel and nearby aids. A float plan ashore adds another source of useful information.
Include the whole emergency sequence
The radio call is one part of response. Assign steering, flotation, fire control, bilge response, first aid and lookout roles. After the call, keep the radio monitored, conserve battery and follow rescue instructions.
Repeat short drills several times during the season and after equipment changes. The goal is not theatrical recitation; it is calm access to the correct controls and facts when attention is overloaded.
Failure modes to avoid
Field checklist
Frequently asked questions
Can I make a radio check on the distress channel?
Do not use the distress and calling channel for casual radio checks. Follow current local and official guidance for approved radio-check methods.
What if I forget the exact Mayday format?
State the vessel identity, position, danger, assistance needed and persons aboard, then listen. Clear facts are more important than silence caused by imperfect memory.
Does a handheld VHF need an MMSI?
DSC-capable equipment and registration requirements vary by use and jurisdiction. Follow current official guidance and the radio documentation.
What should children know?
Older children can learn how to identify the boat, find the information card, point to the radio and summon an adult. Roles should match age and ability.