I use a windpotractor invented by a guy called Olof Bakker from Holland. With a 1/2 mil chart headings can be made instantly, just by laying on the track line, and flight time worked out as well. I have two of them and regard them as must have items. So easy to use only requires the wind speed of the day converted to a percentage of cruise speed in knots. The disque has percentage lines scribed on it so using a china graph the wind direction is pencilled in, then lay this point on the track line on the chart referenced to north and the crossing point on the edge of the protractor is the heading. Take the cruise speed and regard them as degrees and on the inner edge is a time in minutes so 130 knots = 6 minutes which is the time from the wind dot to the edge of the protractor, so just work along the track in these time intervals for total time. It is very clever, so simple and easy to do in flight. Why does anyone use the whizz wheel it's so ackward to use in flight. To find one google it, about £17 pounds from Holland.