Understood @Redrobes ; I figured as much since many maps are of fictional lands/worlds, and though likely not applicable to less advanced cultures' maps, it's a fun aspect to consider for other maps (more so, something that might be creatively played with... e.g. X-world has interesting line forms of declination).

I mention it in that I had to consider it in my own current work. In that fictional setting, I needed to consider the planet is having axial issues due to glacial loss, they've eliminated the people and lost the technology to check magnetic lines, they've lost control over most satellites, etc.. So, they canned tried and true methods and now use communication towers to establish grid lines...so 'north' is determined by grid alignment. But, that sort of underlying, fictional reasoning/nonsense is just fun for me. I like layers to my logic.

Thanks for having a look!

K2