It is possible to transmit all of the following via Inmarsat-C from a vessel except?

Inmarsat-C is designed primarily for data communications and allows the transmission of various forms of information, including telex and text messages that can be delivered by fax, as well as certain data services such as X.400. However, it does not support voice communication.

Inmarsat-C operates in a manner that is optimized for sending and receiving text-based messages rather than real-time voice. This limitation is due to the nature of its service, which focuses on data transmission rather than continuous audio communication. Consequently, while it excels in facilitating messaging and data exchange, users should look to other Inmarsat services like Inmarsat-B or Inmarsat Fleet for voice capabilities.

Understanding the functionality of these communication systems is crucial for mariners, especially in situations where reliable and efficient messaging is needed at sea, but it's equally important to recognize the limitations of each system, such as Inmarsat-C's lack of voice support.