NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2021 Dec 30, 05:43 -0800
Alan,
Not sure but perhaps I'm the Ed you are asking (RE: http://fer3.com/arc/m2.aspx/Air-Navigation-Local-Hour-Angle-Type-X1-computer-EdPopko-feb-2016-g34640).
I have not looked since then. LIke many of these gadgets, they pop up from time to time on eBay or other exchanges thus you have to check periodically to see what's available.
I find these analogue devices,very educational. By playing with them, you build a mental model of how various parameters influence others and by roughly how much. One that taught me a great deal was the Polhemus Celestial Computer - Air Navigation Type CPU-41/P. Intimidating at first because of it's many scales, but once you understand the layout, it's an amazing device. The learning curve was lessened by excelent posts from Gary LaPook and Tracy Shrier, both pilots.
Ed
