EASA NAV(A)intermediate
Why should a pilot check the operating mode before interpreting a GPS deviation bar?
Answer
The full-scale sensitivity of the deviation display depends on operating mode. Without checking the mode, the pilot may misjudge the distance represented by the bar's displacement.
Explanation
A deviation bar is meaningful only in relation to its scale. Since the GPS mode can change full-scale sensitivity, identical bar movement may represent different lateral distances in different modes. **Key takeaway:** Check the active scale before translating display movement into a track correction. **Glossary:** **Deviation bar**: A display of lateral displacement from the desired path; **sensitivity**: The amount of indicated change per unit of actual deviation.
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