EASA NAV(A)intermediate
Describe how a pilot uses the 1:60 rule to estimate off-track displacement and make a correction.
Answer
At 1° of track error, lateral displacement is approximately 1 NM for every 60 NM travelled. The pilot estimates track error from displacement and distance, then calculates a correction that accounts for both the current error and the distance remaining to the destination.
Explanation
The 1:60 rule is a practical small-angle approximation. For example, $X$ NM off track after $D$ NM corresponds to an angular error of approximately $60X/D$ degrees. A direct-to-destination correction must also close the lateral displacement over the remaining distance. **Key takeaway:** Account for both drift already accumulated and the correction needed ahead. **Glossary:** Track error: angular difference from planned track; displacement: lateral distance from track.
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