ACR Electronics, Inc., shares a milestone registration update from the National Oceanic and Atmospheric Administration (NOAA) database which recently hit a record number of 500,000 registered 406 MHz emergency beacons. The beacon to make that milestone was an ACR Electronics ResQLink Personal Locator Beacon (PLB), owned by a Coast Guard Auxiliary member in Rhode Island. Shortly after that the 500,001st beacon successfully registered was an ARTEX Emergency Locator Transmitter (ELT). Beacons come in three designs used for different applications. Emergency Position Indicating Radio Beacons (EPIRBs) which are mounted on boats, Personal Locator Beacons (PLBs) used by outdoors enthusiasts and Emergency Locator Transmitters (ELTs), which are installed on airplanes.