Wrt maps, I'd expect the Lunars with their Moon Boats and their need for maps with which to coordinate a large empire to be the best map makers other than the Mostali. I'd also imagine the Mostali have astoundly excellent maps, and that they occasionally sell lesser copies to outsiders willing to meet their prices. Of course, what a lesser copy means (other than having all info about Mostali removed) may mean is likely quite variable, and may range from less detail to a few outright lies).
Many Thanks-
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