What is the emergency VHF frequency?

The emergency VHF frequency is 121.5 MHz. This frequency is specifically designated for distress calls and emergencies, allowing pilots and aircraft to communicate urgent situations to air traffic control, search and rescue operations, and other aircraft in the area.

When a pilot declares an emergency or requires assistance, they tune their radios to 121.5 MHz to ensure they can reach the appropriate entities who can provide help. This frequency is monitored continuously by air traffic control and is also used by other aircraft, making it critical for emergency communications.

The other frequencies listed, while they may serve important roles in aviation communication, are not designated specifically for emergencies. For example, 123.45 MHz is often used for air-to-air communications, and 121.0 MHz may be used for ATIS (Automatic Terminal Information Service) or other routine air traffic communications, while 125.0 MHz is typically reserved for specific communications within controlled airspace. Thus, 121.5 MHz remains the only regulated emergency frequency for VHF communications in aviation.