What type of services cannot be provided by...

🔍 Key Concepts

• Inmarsat-C capabilities under the GMDSS, especially its primary use for store-and-forward data, telex, and distress alerting • Difference between real-time voice services and store-and-forward data services • Typical Inmarsat-C applications: EGC (Enhanced Group Call), position reporting, and data messaging

💭 Think About

• Which option describes a service that relies on continuous, real-time two‑way audio rather than short data messages? • Think about how Inmarsat‑C terminals are usually used on GMDSS ships: are mariners using them to talk in real time, or mainly to send/receive short written or data messages? • Look at each choice and ask: does this sound like a data/message service or a live voice conversation service?

✅ Before You Answer

• Verify which Inmarsat system (Inmarsat-B / Fleet / FleetBroadband vs Inmarsat-C) is designed for voice calls. • Confirm that Inmarsat-C is primarily a narrowband, store-and-forward data and messaging system, not a broadband audio system. • Check that Inmarsat-C is explicitly used for EGC broadcasts, position reporting, and data/messaging in GMDSS references.

What type of services cannot be provided by the Inmarsat-C system?

Telephone communications via VOIP .

Message transmission to and from a mobile unit.

Broadcast data to groups of mobile terminals.

Position reporting from fleets of mobile units.

🔍 Key Concepts

💭 Think About

✅ Before You Answer