Activating Inmarsat-C is essential for enabling global satellite communication services, including email, messaging, and distress alerting. The activation process involves registering the terminal with a recognized service provider, ensuring compliance with international maritime regulations. Shipowners must submit an application along with terminal details such as the Inmarsat Serial Number (ISN) and vessel information. After approval, the service provider configures the terminal and assigns a unique Mobile Earth Station (MES) number. Once activated, the Inmarsat-C system allows seamless communication between vessels, authorities, and fleet managers. Regular testing and maintenance ensure reliable operation, especially for Global Maritime Distress and Safety System (GMDSS) compliance.