What does an ELT primarily serve as during emergencies?

An Emergency Locator Transmitter (ELT) primarily serves as a beacon for distress signals during emergencies. When activated, typically following a crash or severe impact, the ELT emits a transmission on designated emergency frequencies. These signals can be picked up by search and rescue satellites and organizations, alerting them to the location of the distress, which significantly enhances the chances of a timely rescue. The functionality of the ELT is crucial in ensuring that aircraft in distress can be located quickly, making it a vital safety feature for pilots and passengers alike.

While other options touch on important aspects of aviation safety, they do not accurately represent the primary role of an ELT. For instance, it is not primarily a navigational tool, nor is it a communication device in the sense of facilitating two-way dialogue. Although it may have an ancillary role in emergencies providing some form of power, that is not its main function. Thus, the choice of an ELT as a beacon for distress signals highlights its critical role in emergency situations.