What do the acronyms UNOS and NADS stand for in aviation?

The acronym UNOS stands for "Undershoot North" and the acronym NADS stands for "Overshoot South." These terms pertain to navigation and are often used in the context of aircraft approach and landing procedures, specifically regarding the appropriate correction needed for deviations from the intended approach path, particularly in relation to the runway axis.

When a pilot is approaching for a landing, if they find themselves undershooting the intended approach path, they will need to make an adjustment to correct this. Conversely, if they are overshooting the path, they need to take actions to compensate for this as well. Understanding these concepts is critical for maintaining safe and effective control during aircraft operations, particularly in high-stakes landing scenarios.

The other choices presented do not accurately reflect recognized aviation terminology related to navigation and approach paths, thus emphasizing the importance of knowing the correct definitions and their applications in flight operations.