The great thing about the mechanical E6B computer is that it requires no batteries and gets more accurate the more often you use it! The easy way to use the wind side of the E6B is remember to start with placing the wind direction under the True Index.  Align the grommet over any solid line on the slide, and draw a wind dot UP a distance representing the wind speed. Next, rotate the bezel to place the true course under the True Index. Now, move the slide until the wind dot is over the line that represents the true airspeed. Finally, without moving anything, read your groundspeed under the grommet and read your wind correction angle under the near-vertical line that radiates from the bottom of the slide.