How long must you press the distress button to send a DSC distress signal?

To send a Digital Selective Calling (DSC) distress signal, you must press the distress button for a duration of 5 seconds. This requirement is based on the design of the DSC equipment, which is intended to prevent the accidental transmission of distress signals. Holding the button for the specified time ensures that the operator is intentionally triggering the alarm, thus reducing the likelihood of false alarms.

This is important in maritime communication since a false distress call could lead to unnecessary search and rescue operations, potentially diverting resources from genuine emergencies. The duration of 5 seconds is standardized internationally, and familiarity with this protocol is essential for safe and responsible maritime operations.