Hi,
Hmm. This (Google Maps) is a complicated set of effects. I'm not saying it shouldn't be possible, but I have some issues with the approach. I can try delving into these, but perhaps it might be more productive to first step back and consider something much simpler in all respects, and its another Googly project:
The Google Imaginem Library
Effect 1: Tapestry: An image capable of incredible detail. It could hold a map, but it can also be considered as a two-dimensional grid of miniaturized mental images of pages from books. Millions of such pages can be stored, in perfect detail. Muto requisite so that it retains changes. (Seems reasonable, compared to doing this with all of Mythic Europe. Note that the Tapestry really is a normal image, with no weird 3D inclusions.)
Effect 2: Page View: The user can enlarge a portion of the Tapestry for easier viewing. Alternatively, this effect allows the user to see and focus on tiny details, thereby allowing him to read a page. (Simpler: The region being viewed is much better defined, the magnification is much simpler, and there's no need for rotation or similar operations.)
Effect 3: Page Update: The user can select a page of the Tapestry and change its appearance to match the page of a book he is currently looking at, with size adjusted appropriately. (Simpler: The thing being looked at has better defined boundaries and content, there's no need to account for weird and diverse animal senses, and there's no concern about the location of anything being seen: What you see is what you get.)
At this point, a magus can quickly scan books and libraries of books into the Google Imaginem Library. A magus can display individual pages at will, either to study or copy.
For fun, we can add another effect:
Effect 4: Print on Demand: When page view is active, and a group of inks are available as well as a vellum (perhaps the item has dedicated inkwells and a vellum tray), this effect can be invoked to direct a suitable amount of ink of the appropriate colors onto the vellum to create a copy of the image in Page View. (I'm deliberately not including a Finesse roll here. After all, none of the Google Map effects include one.)
If we cannot get this item to work reliably as a welcome addition to a saga, there's no point considering the map, which I think is rather more complicated, perhaps not even possible as designed.
Anyway,
Ken