Aeronautical charts are regularly updated because operational data such as navigation aids, radio routes, and published airport flight _____ frequently change.

### Why this is right The material specifically notes that navigation aids, radio routes, and airport procedures can change. Current charts help pilots plan with the information that applies to the intended flight. ### The concept A chart is a working source of route and procedure information, not a permanent record that can be assumed current. Changes may affect which aids are available, which route segments are published, or how an airport procedure is flown. Pilots should use updated charts for the area and aerodromes involved in the flight. ### Terms - **Aerodrome**: a defined area intended for aircraft arrival, departure, and surface movement. - **Procedure**: a published sequence or path used for a particular flight operation. ### Remember Before relying on a radio route or airport procedure, check that the chart information is current.