Digital Selective Calling (DSC) is a communication system used in maritime and other radio communications. It allows vessels to send automated distress signals and communicate with other ships or shore stations without needing to speak. DSC uses a unique identifier for each vessel, ensuring that messages reach the intended recipient. When a ship sends a DSC alert, it can include information such as its location and the nature of the emergency. This system enhances safety at sea by enabling quicker responses to distress situations and improving overall communication efficiency among maritime operators.