How long must the distress button be pressed to send a DSC distress signal?

To send a Digital Selective Calling (DSC) distress signal, the distress button must be pressed for at least 5 seconds. This duration is established to prevent accidental activation of the distress signal. Holding the button for this amount of time ensures that the operator is intentionally initiating a distress call, which is critical in situations where emergency help is needed. The 5 seconds acts as a safeguard to confirm that the distress signal is not sent inadvertently, which could lead to confusion or unnecessary responses from rescue services. Ensuring the distress signal is sent only when genuinely required is vital for maintaining the efficiency of maritime communication and emergency response systems.

Options indicating shorter or longer durations would not align with the standardized procedures established for DSC operations. Having this specific duration contributes to effective and reliable maritime distress communication, echoing the importance of clarity in emergencies.