So this is the kind of thing I do just for fun. Tonight I got a bit bored and decided to brush up on my E6B skills. A E6B is sort of like an aviation silde rule of sorts. http://en.wikipedia.org/wiki/E6B I found some practice problems such as this one. You are flying a course of 050 at 90kts. The winds are 070 at 15kts. What is your heading, ground speed, and wind correction angle? So I'd figure out these problems on my IOS E6B. Then with my FAA approved electronic E6B. And finally with the good ole fashion manual E6B. When you don't understand how this thing works it's not fun at all, but when you do, it's kinda fun.