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Is it currently impossible to use "Mark" spell (button inactive)? Or it is only available for use in specific locations?

(+1)

It appears to only be available at non-hub areas. So you can't use it in Gorn but you can use it in the Gorn outskirts. I think it's also only available if you don't have an impending encounter ie. before you hit the explore button or before you hit it again after an encounter.