Mayday signal frequencies on VHF radios — what are they?

Understanding Mayday Signals

Mayday signals are used to alert other vessels or authorities in case of a life-threatening emergency. The phrase “Mayday, Mayday, Mayday” is broadcast on Channel 16 of the VHF radio, which is monitored by all vessels and coastal authorities. It is essential to use the international distress signal “SOS” if your VHF radio does not have the ability to send a digital mayday signal.

Sending a Mayday Signal on VHF Radios

To send a Mayday signal on a VHF radio, follow these steps: First, quickly press the PTT button, then enter the Channel 16 frequency (156.8 MHz) and announce your distress signal. Use a clear, loud voice and speak slowly to ensure your message is understood. After the initial announcement, provide your vessel’s name, position, and situation. Keep your transmission concise, ideally less than 30 seconds, and include the following information: your name, your position (latitude and longitude), your situation, and any other relevant details.

Preparing for a Mayday Situation

Before a situation requires a Mayday signal, it is crucial to be prepared. Make sure your VHF radio is functioning properly and that you have a backup power source in case of a loss of power. Store a copy of your vessel’s safety equipment list, including emergency beacons and flares, in a convenient location. Keep your emergency kit easily accessible, and make sure your crew is trained on the procedures for sending a Mayday signal and using emergency equipment.