Question 35E3

Statement A is incorrect because not all EPIRBs transmit their position in the outgoing signal. Older EPIRBs and many current 406 MHz beacons transmit only a unique identification code. Their position is determined by the COSPAS-SARSAT system using Doppler shift analysis as the satellite passes overhead. GPS-enabled EPIRBs (often called GPIRBs) *do* include their GPS coordinates in the transmission, providing a faster and more accurate initial fix. Therefore, the statement reverses the functionality. Statements B, C, and D are all true: B) COSPAS-SARSAT utilizes Low Earth Orbit (LEO) satellites with near-polar orbits that relay distress signals to ground stations called Local User Terminals (LUTs). C) For beacons without internal GPS, the satellites determine the EPIRB's location by analyzing the Doppler shift of the beacon's signal frequency. D) EPIRBs are satellite beacons designed to alert rescue authorities and provide a homing signal (typically 121.5 MHz) for search and rescue teams once they are in the vicinity.