The Abrams Sun Compass

I got my hands on an Abrams sun compass, a WWII era navigation device for use in the desert - it works differently from the Bagnold compass but I think once a person got used to using it they wouldn't find it much more difficult. This is a quick video on how to use it, omitting some of the more tedious details which wouldn't be of much interest to someone that didn't have one on hand. This compass can also be used at night. Video on that soon.

What I called local solar time is correctly Local Apparent Time (LAT).

I rushed through the time conversion so here's how to do it. Take your local "watch time" subtract daylight savings time if it is in effect. Now determine how far east or west (in degrees) you are from the center of your time zone*. If east, add 4 minutes per degree to your time, subtract if west. Now lastly, factor in the equation of time which you can find right on the date bar of your compass. Add or subtract that to your time and you now have what is called 'local apparent time'. Easy, the manual took 8 pages and 3 diagrams to explain that and I believe the example within is easy to misinterpret when using the time zone chart.

https://susdesign.com/popups/sunangle/time-basis.php

*If you are moving east or west for long distances you will have to adjust for the time zone factors more often.