What is the primary function of Digital Selective Calling in GMDSS?

The primary function of Digital Selective Calling (DSC) within the Global Maritime Distress and Safety System (GMDSS) is to send urgent distress alerts and position information. This system is designed to enhance the safety of ships at sea by enabling efficient recognition of distress situations. When a vessel is in need of assistance, it can use DSC to automatically send a distress alert to all ships and shore stations within the radio coverage area.

The distress alert includes vital information such as the vessel's unique identification and its current position, enabling rescuers to locate the distressed vessel quickly and effectively. This automated communication capability significantly speeds up the response time in emergencies compared to traditional voice communication, ensuring that help can be dispatched as quickly as possible.

DSC can also be used for routine communications but its primary and most critical function relates to issuing distress alerts, which directly supports the overarching goal of enhancing maritime safety.