EASA NAV(A)intermediate
Arrange the steps in the correct sequence for interpreting a GPS Course Deviation Indicator (CDI) to determine lateral cross-track error.
Answer
Identify the active GPS operating mode (e.g., Enroute, Terminal, Approach), Determine the full-scale deflection sensitivity associated with that mode, Read the CDI needle displacement from center, Calculate the lateral cross-track error relative to the desired track
Explanation
The mode determines display sensitivity. Establish the scale first, then interpret bar displacement and determine the lateral error. **Key takeaway:** Scale awareness must precede quantitative interpretation. **Glossary:** **Full-scale distance**: The lateral distance represented at maximum bar deflection; **desired track**: The intended ground path.
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