What is the primary function of DSC in GMDSS?

The primary function of Digital Selective Calling (DSC) in the Global Maritime Distress and Safety System (GMDSS) is to automate distress call transmissions. DSC is designed to enable ships to send and receive distress alerts and safety messages quickly and efficiently. When a vessel experiences an emergency, it can transmit a distress call with a single action, which automatically includes vital information such as the vessel's identity and position.

This automation is crucial in emergency situations where time is of the essence, allowing for a rapid response from search and rescue operations. The DSC system operates on designated frequencies, ensuring that the distress call reaches all relevant parties, which enhances the chances of timely assistance. The technology bypasses the need for operators to send distress messages manually, significantly increasing the reliability and speed of distress communications at sea.

Other options may cover various aspects of communication or regulation within maritime operations, but they do not primarily focus on the unique role that DSC plays in automating and streamlining distress communication.