Which of the following best describes Inmarsat-C operation?

Correct Answer: Option D — Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities.

Inmarsat-C is a digital, store-and-forward messaging system designed for non-real-time data exchange. It supports critical GMDSS functions including Enhanced Group Call (EGC) for SafetyNET/FleetNET, automated distress alerting, and periodic data reporting or polling, making it a cornerstone of maritime safety communications under IMO GMDSS requirements.