What does the term "navigation display" typically show?

The term "navigation display" typically refers to a screen in the aircraft's cockpit that provides essential information for pilots to navigate safely and efficiently. This display shows various elements such as flight plans, which outline the intended route the aircraft will take, as well as real-time weather information that can affect flight operations. By integrating this data, the navigation display aids pilots in making informed decisions regarding their flight path, ensuring adherence to air traffic control instructions, and avoiding adverse weather conditions.

The other options do not capture the comprehensive nature of what a navigation display provides. While airspeed and altitude are crucial flight parameters, they are typically found on a different type of display. Engine diagnostics are usually monitored through engine instruments or systems dedicated to performance metrics, not on a navigation display. Similarly, external aircraft systems can be monitored but do not focus predominantly on navigation tasks, which is the primary role of the navigation display.