ELT-Emergency Locator Transmitter

An Emergency locator transmitter (ELT) is an equipment which broadcasts distinctive signals on designated frequencies and, depending on application, may be automatically activated by impact or be manually activated. A suitably configured ELT is an integral component of the international satellite system for search and rescue (SAR) (COSPAS-SARSAT). When activated manually - or automatically by immersion in water or as a result of high ‘g’ forces on impact - ELTs transmit a distress signal which can be detected by non-geostationary satellites and then located precisely by either or both of GPS trilateration and doppler triangulation. an ELT operate on both 406 MHz and 121.5 MHz.