What type of information does the DSC MMSI number provide?

The Digital Selective Calling (DSC) Maritime Mobile Service Identity (MMSI) number uniquely identifies a specific vessel. This 9-digit number is essential for various functions within the Global Maritime Distress and Safety System (GMDSS), as it allows for the precise delivery of distress alerts and routine communications. When a ship sends a DSC call, the MMSI number helps recipients recognize exactly which vessel is sending the message, ensuring that communications are directed appropriately.

This identification is critical for search and rescue operations, as it helps authorities quickly locate and assist a ship in distress. Although the MMSI number can be linked to a ship's type or communication capabilities, its primary purpose is to serve as a unique identifier for each vessel, distinguishing it within maritime communications. In contrast to other options, the use of the MMSI is not limited to emergency communications, as it is also employed for routine calls and notifications.