NavList:

Brad,

Your check of the scales is very helpful.  Thanks for the cut.

Before this thread, I had not ever looked at old editions of Bowdith for Gunther Rule information, always fixed on other topics. This is shortsighted for sure as there is a wealth of information and technique which tie a lot of navigation practice together.

I get personal flashbacks when looking at slide rules of any kind. When I entered a college engineering program in the early 1960s, you were first required to attend a summer school program (two sessions per week for six weeks) to learn how to use a rule. It was non-credit (pass or fail) and taught by a Cape Canaveral engineer as part of some science public-outreach program. The classroom had an enormous sliderule hung by chains from the ceiling. And every lecture was how to use a different scale and followed by take-home problem-sets.

Ed