What is the main function of the Navigation Display (ND)?

The main function of the Navigation Display (ND) is to provide situational awareness by showing the aircraft's position relative to navigation aids. This visual representation is crucial for pilots, as it helps them understand where they are in relation to their intended route, nearby airports, and various navigational fixes.

The ND features various modes and map views, such as route mapping and waypoint indications, which allow pilots to track their progress and make informed decisions regarding navigation. This situational awareness is aided by the integration of data from various sources, including GPS, VOR, and other navigational systems, enhancing the pilot's ability to navigate safely and efficiently.

While the other choices might describe important functionalities of various cockpit displays or systems, they do not accurately reflect the primary purpose of the Navigation Display. Engine performance data, traffic alerts, and weather information are typically presented on separate displays or systems designed specifically for those functions, emphasizing the unique role that the ND plays in navigation and situational awareness during flight.