I am always been a fan of old navigation techinque and I really like to use a Sexstant to find my position on earth. This instrument, the Quadrant, is the predecessor of the Sexstant and it really usefull if you like to calculate altitude of mountains or distance from a certain object and even to calculate your position on earth by using it in cobination with a normal clock.
I've uploaded a simple guide on how to use it with some examples.
The hardware you need:
How to assemble the quadrant and how I made it: https://youtu.be/rKAefZo1f6w
As always CAD files are uploaded so you can modify my design to fit your needs.
If you have a similar size flanged ball bearing:
Every part can be printed with no support material!
How I've designed and 3D printed thi quadrant & how to assemble it.
CAD model in Fusion 360