🔍 Key Concepts

• INMARSAT-B as a GMDSS satellite system (what kinds of traffic it is designed to handle) • Differences between real-time services (like voice calls) and store-and-forward services (like simple messaging) • Whether INMARSAT-B coverage is generally global within satellite footprints or restricted only to narrow spot beams

💭 Think About

• Look at each choice and ask: does this describe a system that can support normal telephone-quality voice, fax, and data in (mostly) real time, as used on GMDSS ships? • Which option sounds more like a store-and-forward messaging system instead of interactive voice/data communications? • Which option is describing a coverage limitation rather than the types and speeds of services offered?

✅ Before You Answer

• Make sure the option you pick includes both voice and data (and usually fax) capability, not just one type of service. • Be careful with any choice that talks only about store-and-forward high-speed data – that usually indicates a different INMARSAT service than INMARSAT-B. • Check whether the description is about service types/speeds (what the question is asking for) versus only describing coverage/antenna characteristics.