PLB 2
PLB 2 : Personal Locator Beacon. A 406 MHz PLB is a battery-powered emergency transmitter which, when activated, sends a coded signal. A signal received by the Cospas-Sarsat Satellite System from a PLB is considered to be an indication of serious distress and activates search and rescue authorities. Relates to Emergency Locator Transmitter (ELF) and to Emergency Position Indicating Radiobeacon (EPIRB)