The back side of the E6B calculates how wind affects your direction and speed. It utilizes a clear plastic slide, a rotating azimuth grid, and a reference grommet (the center hole). Exercise 4: High-Altitude Wind Vector Analysis True Course (TC): 090∘090 raised to the composed with power True Airspeed (TAS): 120 knots Wind Direction / Speed: 180∘180 raised to the composed with power at 25 knots Find: True Heading (TH) and Groundspeed (GS) Verified Solution: