Mxsmanic wrote:

Ron Natalie writes:

Whizwheels were the classic, calculators are acceptable.

A whizwheel being like the small E6-B I got at the pilot store?

that's the one. Though whizwheel is a more generic term for
circular slide rules and can also refer to different variants
like the Jeppesen CR-5 (the main difference is how the wind
triangle is computed on the backside)

--Sylvain