What is DSC?
Unlike traditional VHF radio systems where users listen passively until they hear a call directed at them, Digital Selective Calling (DSC) streamlines communication by first notifying the intended recipient(s) with an alert. This way, recipients know the message is for them, so they’re prepared to listen on the correct channel when the message begins. This targeted approach enhances efficiency and reduces the risk of missed or unclear communications.
DSC is a system that uses VHF channel 70 to send targeted messages. Each DSC call contains essential information like your vessel's identification number (MMSI), the purpose of the call (e.g., routine, safety, distress), your position, and the channel you'd like to use for voice communication. This system enables efficient, automated calling, helping you reach specific vessels directly without relying on open channel broadcasts.
DSC calls are categorized into four priority levels to ensure that urgent communication is managed effectively:
Distress - For immediate assistance in emergencies.
Urgency - For serious but not life-threatening situations.
Safety – For navigational or weather warnings.
Routine – For standard communication, such as checking in or coordinating with other vessels.
You can initiate any type of DSC call using the DSC CALL softkey found on each of the main screens. Once you press it, simply use the arrow keys to navigate through the different call types, and select your desired option by pressing the OK button. This straightforward process allows you to quickly and efficiently send the appropriate signal, whether it’s for distress, urgency, safety, or routine communication.