TC 040°, TAS 180 kt, wind 350°/30 kt. What is approximate GS?
Answer
159 kt
Explanation
The wind from 350° is largely a headwind relative to the northeast course, with a crosswind component. Vector resolution gives a groundspeed of about 159 kt. **Key takeaway:** Resolve wind into along-track and cross-track components to estimate GS. **Glossary:** **TAS**: Speed through the air; **GS**: Speed over the ground.