Which item transmits signals for location determination upon activation?

The Emergency Locator Transmitter (ELT) is designed to transmit distress signals to assist in locating an aircraft or vessel in case of an emergency. Once activated, the ELT sends out a specific signal on designated frequencies, which can be detected by search and rescue satellites and aircraft, facilitating a quicker response for locating the distressed entity.

This function is critical for ensuring safety in aviation, as ELTs are often required by aviation regulations to be installed in aircraft. Their ability to provide accurate location information significantly increases the chances of timely rescue operations, making them a vital component of aviation safety equipment.

While other options may sound similar, they either do not specifically refer to the established technology used in aviation emergencies or relate to broader concepts of signaling rather than the standardized emergency locator function that ELTs provide.