If your template includes ALWAYS keeping carto on it then you can use them, anyone with GM carto can read an already decoded map. If you decode your maps then stone carto for skill swaping then you must wait until the maps reset which should be soon.
If you dont want to wait you can always throw them on a vendor PEOPLE WILL buy them, or you can just toss em in a bag, go to brit library and turn em in.
Reguardless of what you do it is always wise to save em up AFTER youve dug the treasure and turn em in for points.
I strongly urge you to configure your template to include carto for now to get the maps outta the way. Once they reset they will have random locations and will no longer correspond to the THB rune library or the THB treasure maps.
Good Luck!