Which type of station communicates using a 9-digit MMSI number?

A 9-digit Maritime Mobile Service Identity (MMSI) number is utilized by various types of maritime stations, including group stations, coast stations, and ship stations. The MMSI serves to uniquely identify maritime communication equipment for routine transmissions, ensuring that messages are directed to specific receivers.

Group stations use a 9-digit MMSI to identify a group of vessels that are part of a collective communication, allowing for efficient management of communications within that group. Coast stations, which are land-based stations facilitating communication with sea vessels, also employ a 9-digit MMSI for identification in the maritime communication system. Ship stations, which are located on watercraft themselves, likewise utilize a 9-digit MMSI to ensure that their distress signals and routine communications can be accurately addressed and verified.

In specific terms, each of these stations contributes to a cohesive communication network that enhances the safety and coordination of maritime operations, utilizing the same system of MMSI classification for clarity and efficiency. Thus, the identification of all three types of stations under the 9-digit MMSI system is entirely correct.