What is the best description for the INMARSAT-C system?

The INMARSAT-C system is best described as a store-and-forward system that provides routine and distress communications. This system is specifically designed to handle messages that are not necessarily time-sensitive, allowing users to send and receive messages to and from ships, aircraft, and ground stations. Its store-and-forward capability means that messages can be stored temporarily if the recipient is not available, and then forwarded once they are ready to receive them. This feature is particularly important for maritime and aviation communication, where reliable message delivery can be critical in emergency situations.

The INMARSAT-C system also supports distress communications, which is vital for safety at sea and in aviation. It can send alerts and other critical information to ensure that help is dispatched quickly when needed. This makes the system especially valuable for those in remote locations where traditional communication methods may not be available.

In contrast, real-time communication systems focus on instantaneous message exchange, which is not the primary function of INMARSAT-C. It does not primarily operate as a multimedia communication network, which would involve video and audio transmission in addition to text. Similarly, while the system does allow for two-way communication, it is not limited to this single function, as its store-and-forward capability is a defining feature.