What is the function of a communication box on ATC charts?

The function of a communication box on ATC charts is to serve as a guide for navigational aids. These boxes typically contain critical information that assists pilots and air traffic controllers in managing communications efficiently. They may indicate frequencies for pertinent air traffic control services, which are essential for maintaining effective communication with various ATC facilities. This helps ensure that pilots are in contact with the correct authorities for flight safety and navigation.

The presence of navigational aids, such as VORs (VHF Omnidirectional Ranges) or NDBs (Non-Directional Beacons), is crucial for pilots to understand how to navigate through controlled airspace. The communication box provides necessary information to facilitate these operations, enhancing situational awareness and ensuring compliance with air traffic regulations.