🔍 Key Concepts

• Inmarsat-C terminal self-testing capabilities and built-in functions • Difference between internal electronic checks and over-the-air message checks • Purpose of routine terminal tests vs. operational distress communications

💭 Think About

• Ask yourself: which option relies least on outside stations or other ships and can be done anytime, even at sea, without coordination? • Which method is specifically designed by the equipment manufacturer to verify that the terminal’s internal components and basic functions are working correctly? • Which options might misuse distress or safety resources like an RCC, or depend on other users being available and cooperative?

✅ Before You Answer

• Verify which choice reflects a built-in test feature of the equipment rather than an operational radio procedure. • Check whether involving an RCC (Rescue Coordination Center) is appropriate for routine equipment testing or reserved for emergencies/safety-related traffic. • Confirm which method can be performed quickly, repeatedly, and independently without tying up operational communication channels.