hehe, I love how easy it is to display sarcasm over the internet. 3rd grade would, generally be 9 years old.
I think it helps if you have an intimate understanding of a slide rule. I don't mean knowing how to figure out your groundspeed on your E6-B, but understanding how it works; how al it does is setup ratios, and eventually you can do multiplication, division, and all kinds of other things with it. When it came time for my ground school lesson on it, I had a Marine C-130 navigator explain every nuiance of it, and it helped me not only get a better understanding of how to use an E6-B (well, I use a CR actually, but same concept) but how to better aproximate things in my head, It is something that has been sorely lacking in public education in the past 25 years, I've noticed.
Happy contrails - I support B747Skipper and Jetguy