What does 'cross-checking' in navigation help to ensure?

Cross-checking in navigation is a crucial practice that involves verifying navigational data using multiple sources to ensure accuracy. This process enhances the reliability of the information a pilot or navigator relies on during flight. By comparing data from different instruments or external sources—such as GPS, VOR, and charts—navigators can identify discrepancies and correct any potential errors before they lead to navigational issues.

For instance, if one navigational source is reporting a different position than another, cross-checking allows the navigator to investigate and resolve the inconsistency, thereby improving safety and precision in the flight path. The process is vital in maintaining situational awareness, avoiding navigational errors, and ensuring compliance with airspace requirements, all of which contribute to successful and safe navigation.

Other options, while related to navigation, do not characterize the purpose of cross-checking accurately. Fuel efficiency, air traffic management, and route determination are important aspects of flight operations, but they do not specifically encapsulate the essential function of verifying navigational data for accuracy that cross-checking provides.