What information is included in an MMSI number?

An MMSI (Maritime Mobile Service Identity) number is specifically designed to uniquely identify maritime mobile stations, which includes vessels equipped with maritime communication equipment. This unique nine-digit number is essential for communication purposes, especially in the context of digital selective calling (DSC) systems and automated identification systems (AIS). The MMSI facilitates reliable and efficient identification of vessels during radio communications and helps ensure that safety messages and distress calls reach the appropriate parties, such as search and rescue services.

While options such as home port information, lists of crew members, and emergency contact numbers hold importance in maritime operations, they are not included in the MMSI number itself. The MMSI is strictly focused on providing a distinctive numeric identifier for each vessel, allowing for accurate tracking and communication without incorporating additional logistical details about the vessel or its personnel. This specialized function underlines the importance of the MMSI number in ensuring safe maritime navigation and communication.