The Inmarsat-C ISN (Inmarsat Serial Number) is a unique identifier assigned to each Inmarsat-C terminal. Inmarsat-C is a satellite communication service widely used in the maritime industry for text-based messaging, distress alerts, and data transmission. The ISN helps in identifying and tracking terminals within the Inmarsat network, ensuring secure and reliable communication. Each terminal registered with Inmarsat receives a unique ISN, which is crucial for operational efficiency and regulatory compliance. The ISN is used for authentication, enabling users to send and receive messages securely. This number is essential when registering a terminal with authorities such as flag states, maritime security centers, and service providers. The Inmarsat-C system operates via geostationary satellites, offering global coverage, including remote oceanic regions where traditional communication methods are unavailable. It plays a critical role in the Global Maritime Distress and Safety System (GMDSS), allowing ships to send distress signals in emergencies. Ship operators must ensure their Inmarsat-C terminals are properly registered and updated to comply with international maritime communication standards. The ISN is an essential component for efficient maritime communication, ensuring vessels remain connected and able to transmit vital information at sea.
