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TB - How do the scouts work exactly?

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Do they find everything in a certain area on the map? Or a limited amount in a certain area? Or do they find the x closest markers no matter of distance?
 
As far as I've seen so far, they seem to reveal a limited amount in relation to Meve's position. Signboards still appear to reveal certain points of interest which scouts may miss. I'm not quite certain about the exact arrangement, but this has been my experience.