🔍 Key Concepts

• 406 MHz EPIRB functions – what frequency is used for global satellite alerting vs. local homing • Difference between a 406 MHz alert beacon and a 121.5 MHz homing beacon • Role of an automatic float-free / hydrostatic release and a strobe light on EPIRBs

💭 Think About

• Identify which frequency modern COSPAS-SARSAT satellites listen to for the main distress alert and which frequency is mainly for short‑range homing by SAR units • Look at each answer choice and separate the items related to long‑range satellite alerting from those related to close‑range homing • Decide which combination best matches a standard 406 MHz satellite EPIRB: its alert frequency, its homing frequency (if any), and its automatic release feature

✅ Before You Answer

• Verify which is the primary distress alert frequency for satellite EPIRBs: 406 MHz or 121.5 MHz • Verify which frequency is typically used as the low-power homing signal to guide rescuers once they are nearby • Check which device – float-free bracket vs. hydrostatic release mechanism (HRU/ARM) – is normally associated with automatic deployment of an EPIRB from a sinking vessel