Which mode of communications is NOT possible through an Inmarsat-C SES?

The Inmarsat-C Satellite Earth Station (SES) provides specific communication modes suitable for maritime purposes. Among the various functionalities, "Emergency Activation" can be performed, enabling vessels to send distress alerts in critical situations. This feature is crucial for safety at sea, allowing for rapid communication with rescue authorities.

The option indicating "Data" refers to the transmission of various types of digital information, which is a core function of Inmarsat-C, further enhancing operational capabilities for maritime operators.

"TELEX" is another communication method supported by Inmarsat-C, which allows ships to send and receive messages in a telex format, popular among maritime users for its simplicity and effectiveness in conveying information.

Conversely, "Shore-to-ship Facsimile" is not supported by Inmarsat-C. The system is designed primarily for digital data transfer rather than high-bandwidth applications such as facsimile transmission. Facsimile services typically require higher data rates than what Inmarsat-C can provide, making it unsuitable for this purpose. Thus, the correct answer reflects a limitation within the capabilities of Inmarsat-C communications.