What is the best way to test the Inmarsat-C terminal?

Sending a brief message to your own Inmarsat-C terminal is the best way to test its functionality because it allows you to verify that the terminal is capable of both sending and receiving messages without relying on external factors such as other terminals or shore systems. By composing and sending a message to your own terminal, you can ensure that all internal components are working correctly, including the message composition system, transmission capability, and reception. This testing method is straightforward and eliminates potential complications arising from network connectivity or other external factors, making it an effective way to check that your terminal is operational before relying on it for communication with others.