Which system is utilized for transmitting Enhanced Group Calls?

The system utilized for transmitting Enhanced Group Calls is the Inmarsat satellite system. Inmarsat provides global satellite communication services that enable maritime users to send distress signals, safety messages, and operational communications. The Enhanced Group Call feature allows a ship to communicate with multiple recipients simultaneously, which is particularly useful in emergency situations or for coordinating responses among various vessels and organizations.

Inmarsat's advanced capabilities in message handling and connectivity make it the preferred choice for enhanced communications at sea, ensuring that messages reach multiple vessels effectively and efficiently. This functionality is crucial for maintaining safety and operational readiness in maritime environments.

Other options, while essential for various communication needs, do not address the specific capability of Enhanced Group Calls. COSPAS satellites are used for search and rescue operations and do not specialize in group calling; HF SITOR shore stations facilitate single point-to-point communication rather than group calls; and NAVTEX stations primarily broadcast navigational and safety information, not enhanced group communication.