🔍 Key Concepts

• Differences between EPIRB classes and categories (Class A/B vs Category I/II) • Which satellite systems handle 406 MHz COSPAS-SARSAT alerts vs INMARSAT alerts • What the term L-band refers to in satellite communications

💭 Think About

• First, recall which EPIRBs are associated with the older 121.5/243 MHz system and which with 406 MHz and satellites • Think about which satellite network INMARSAT uses (geostationary, L-band) and which EPIRB type is specifically designed to work on that band • Match the band or class name in the choices to the satellite service used by INMARSAT

✅ Before You Answer

• Identify which options are legacy 121.5/243 MHz devices that are no longer GMDSS-compliant • Confirm which option clearly refers to the frequency band used by INMARSAT for distress and safety communications • Eliminate any answer that only describes mounting/release method (e.g., float-free vs manual) rather than the satellite link itself