Gremlins....
In case you have not seen the explanation before, sometimes MS Word gives us headaches by reverting to prior versions of edited text. That is what happened there.
Both the Wizard's Mark and the Locate Landmark spell were in a product called the HARP Grimoire, which ICE removed from sale due to a request from one of the authors after a misunderstanding (i.e. we published it due to misunderstanding, and then removed it from sale after things were figured out).
Some of the spells from the Grimoire made their way into the Codex. The "Locate Landmark" spell was not one of them (the spell essentially gave bearing and distance to the "landmark", which made it very useful in mapping).
The references to the spell were removed, but in pouring the text into pagemaker, it reverted and we missed the catch.
As for the Permanent thing -- IIRC, this was for those casters who added a wizard mark to magic items that they created (using spells from College of Magics) (the Landmark bit allowing them to find stolen items, and the Remove Mark for if they sold any Marked items).
If you wanted to add a Permanent scaling option, you could, but I would say it required at least +12 PP to do so.