EASA NAV(A)intermediate
Match each navigation quantity to its correct definition: Quantities: 1. True Airspeed (TAS) 2. Groundspeed (GS) 3. True Heading (TH) 4. True Course (TC) Definitions: A. Speed of the aircraft relative to the surrounding air mass B. Speed of the aircraft relative to the ground C. Direction in which the aircraft's nose (longitudinal axis) points relative to true north D. Direction of the aircraft's track or intended path over the ground relative to true north
Answer
1-A, 2-B, 3-C, 4-D
Explanation
The wind triangle distinguishes air-relative quantities from ground-relative quantities. TAS and TH describe motion or direction through the air, while GS and TC describe the resulting ground movement. **Key takeaway:** Wind explains why heading, course, TAS, and GS may differ. **Glossary:** Wind triangle: vector model connecting air, wind, and ground motion.
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