They are available as an Automatic Fixed Emergency Locator Transmitter or Automatic Portable Emergency Locator Transmitter depending on which mounting tray is specified. The 503 series of Emergency Locator Transmitters has been fitted on all types of platform including GA aircraft, helicopters, commercial airliners and military fast jets.

The 503 series of Emergency Locator Transmitters can be interfaced to the aircraft’s on board GPS system, without a separate interface unit, to ensure even faster detection times in the event of an emergency. Allcommon GPS protocols are supported, and for aircraft not fitted with GPS the 503 series of Emergency Locator Transmitters can be specified with its own embedded GPS card.