What does UNOS stand for in compass navigation?

• A. Undershoot North, Overshoot South
• B. Unos
• C. Undershoot South, Overshoot North
• D. North overshoot

Answer: (A)

UNOS stands for Undershoot North, Overshoot South. This mnemonic helps you remember how your cross-track position behaves when intercepting or tracking a course with a VOR/OBS on a compass. If you’re north of the desired course line and you turn to intercept that course, you’re more likely to stay to the north and not reach the line on the first pass—that’s an undershoot. If you’re south of the line, turning toward the course will push you past it to the south—that’s an overshoot. Use this to anticipate where you’ll cross the course and plan your intercept angle accordingly, especially when wind or wind correction is a factor. The other phrasings aren’t the standard mnemonic for this concept.