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What distance does DME indicate?
Answer
Slant range
Explanation
DME measures the direct, line-of-sight distance between the aircraft and the ground station: the **slant range**. At substantial height and close to the station, this can be greater than the horizontal ground distance. **Key takeaway:** DME is not automatically a ground-distance measurement. **Glossary:** **Slant range**: straight-line distance between two points at different heights.
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