Mxsmanic wrote:
What is a Wizwheel? It sounds almost like a slide rule.
Slide rules are obsolete now, but they were (and remain) extremely
well suited to some of the types of calculations that pilots and
others must do rapidly under less than ideal conditions. Does anyone
still use them for aviation?

Yes, it's usually required by instructors. See this entry (I wrote the
history section) :

http://en.wikipedia.org/wiki/E6B

As an aside, I have spent a lot of effort trying to determine if
"wizwheel" or "whizwheel" was the original slang term. I preferred the
former, but I'm finding more evidence for the latter... derived from
"whiz" kids instead of "wizard" users. Not set in stone though.

Kev