It's a sun compass. Hope you can find the plans.
Fun to play with (but no longer a serious navigation tool) . If you have space for almanacs to be completely analogue you have space for a GPS and it's power supply. If the data tables are digital you need power. Measuring shadow height to get latitude needs something hundreds of feet tall to do well.
If someone pushes the button and takes out the satellites we`ll all just be heading away from the mushroom clouds. Once there is only bright light coming from one direction just stick a stick in the ground and use stones to track the shadow, same effect to get an E/W line.
Can't see a spirit level on the printed one? These are accurate to a couple of miles a day on direction at best, so a even slight angle on key readings at stops will ruin your day. Should be easy to add one.
I have an MOD issue one I can still get out to frighten the kiddies. The idea that only 30 years ago you'd move using a backwards sundial and a clock you had to wind up (set to pips on the BBC) and then have to look for landmarks with binoculars has them reaching for the I-charger
Poste Restante instead of text also gives millennials nightmares
Good luck with the project
Andy
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