What is the frequency 122.9 used for?

The frequency 122.9 MHz is primarily designated for the purpose of annunciating the positions of aircraft when they are not communicating with Air Traffic Control (ATC). This frequency is known as an Unicom frequency used at many airports for pilots to communicate with each other in uncontrolled airspace, allowing them to announce their positions, intentions, and to maintain situational awareness among other pilots in the area. This is particularly important in situations where ATC is not available, ensuring safety and effective coordination among pilots.

While other frequencies serve distinct purposes, such as ATC communication, emergency broadcasts, and weather information dissemination, 122.9 MHz focuses specifically on pilot-to-pilot communication in the absence of ATC guidance, making it essential for safe operations near uncontrolled airports.