What must pilots do when they are unsure of their navigation due to airspace changes?

When pilots are unsure of their navigation, particularly due to airspace changes, the most appropriate action is to communicate with Air Traffic Control (ATC). ATC exists to support pilots by providing them with essential information regarding their flight path, including any changes in airspace, current weather conditions, and traffic advisories. By communicating with ATC, pilots can receive real-time guidance, clarifications on airspace boundaries, and updates on any temporary flight restrictions or altered routing. This proactive approach ensures safety, compliance with regulations, and helps prevent potential conflicts with other aircraft.

Other options, such as proceeding with the planned route without verification or only consulting flight manuals, can lead to navigation errors or infringements on restricted airspace. Assuming a position is safe without verification undermines the importance of situational awareness and could result in dangerous encounters with other aircraft or airspace violations. Active communication with ATC is the most reliable way to ensure safe navigation and adherence to the National Airspace System rules.