How is a transmitting distress signal typically initiated on a radio?

• A. By calling the local coast guard on any channel.
• B. Shouting for help and waving.
• C. Use Channel 16 on VHF and then switch to a working channel, or use DSC with the device.
• D. Send a text message to the authorities.

Answer: (C)

In marine radio practice, distress signals are started on the designated distress channel because it’s the channel that coast guards and most vessels continuously monitor. To initiate a distress, you first call on that channel, clearly signaling “Mayday” and identifying your vessel, your position, what’s wrong, and what help you need. Once contact is established, you switch to a working channel for further conversation so the distress channel remains open for others who may still need it.

If your radio has DSC (Digital Selective Calling), you can also initiate a distress by using the emergency function. DSC sends an automated digital Mayday with your vessel’s MMSI and location to nearby coast stations and vessels, which can speed up the alert and coordination even if you cannot voice the message immediately.

This approach is preferred because shouting or waving doesn’t reach other radio operators, and contacting the coast guard on “any channel” isn’t a reliable or standardized method. Texting is not how marine distress signaling is typically handled. Channel 16 and DSC cover the established, effective ways to initiate an emergency on a radio.