Which of the following are terms related to the definition of fixes or waypoints?

The correct choice refers to the concept of waypoints or fixes in the context of aviation navigation. Waypoints are specific geographic locations defined by coordinates that pilots use for navigation. The definition of waypoints often involves reference to their position in relation to navigational aids (NAVAIDs), which are installations that provide information for aircraft navigation.

When discussing "degree-distance from NAVAIDs," it highlights how waypoints are sometimes defined using angular measurements (degrees) and distances (nautical miles or other units) in relation to established NAVAIDs. This angle and distance help pilots determine their current position and course relative to the NAVAID, which is crucial for navigation.

Understanding this concept is essential for pilots, as it helps them navigate safely and accurately, especially in complex airspace environments and during approaches and departures.

The other options do not accurately describe how waypoints are generally defined or referenced in aviation. For example, while elevation levels and ground speeds can be relevant in other contexts, they do not directly pertain to the definition of waypoints as it relates specifically to navigation using NAVAIDs.