🔍 Key Concepts

• Maritime Safety Information (MSI) services under the GMDSS (Global Maritime Distress and Safety System) • Types of equipment that receive NAVTEX, EGC (Enhanced Group Call), and HF SITOR/NBDP broadcasts • Difference between Inmarsat terminals used for MSI only versus those used mainly for routine/commercial traffic

💭 Think About

• For each option, ask yourself: does every piece of equipment listed actually receive MSI broadcasts as one of its primary GMDSS functions? • Think about which systems are specifically designed for navigational and meteorological warnings versus those mainly used for two‑way communications (telephone/telex/data). • Compare the lists: which answer choice best groups only equipment that is normally recognized as MSI receivers in GMDSS training materials?

✅ Before You Answer

• Verify which systems are explicitly listed as MSI receivers in GMDSS: NAVTEX, EGC, HF SITOR (NBDP), and certain Inmarsat variants. • Check whether Inmarsat B or F77 are primarily distress/urgency/ship–shore communication systems rather than dedicated MSI broadcast receivers. • Make sure you are not selecting an option just because it seems broad (like “all of these answers”); confirm that every item in that option correctly functions as an MSI receiver.