🔍 Key Concepts

• COSPAS-SARSAT system segments (space segment vs ground segment vs SAR services) • Role of Doppler shift in locating 406 MHz EPIRBs • What an EPIRB can and cannot do in terms of two‑way communications

💭 Think About

• For each option, ask yourself: is this something a satellite actually does, or is it done on shore by ground stations and rescue coordination centers? • Think about how a 406 MHz EPIRB alert travels from beacon to satellite to Local User Terminal (LUT) and then to the Rescue Coordination Center (RCC). • Consider whether COSPAS‑SARSAT satellites are designed for location and alerting only, or for ongoing voice/data communications with SAR units.

✅ Before You Answer

• Verify which functions are part of the satellite’s job (receive, measure, time‑tag, forward) versus the ground segment’s job (database lookup, mission coordination). • Check whether 406 MHz EPIRBs and COSPAS‑SARSAT satellites support follow‑on search and rescue communications, or just distress alerting and location. • Make sure the function you pick is inconsistent with the basic one‑way emergency beacon concept of an EPIRB.