I think the problem with this is that there is in fact a tiny amount of leeway in obtaining this title. In reality, to get the 100% Grandmaster Cartography title, you only have to uncover about 99.5%(approx) of the true 100% total.
I have 100% of the Tyrian map and 99.6% of the Canthan map and from looking at other people's maps I know that there are minute subtle differences in them all.
This would make it very hard for the program to know when to tell you that a particular individual zone was 100% complete - if this makes any sense.
It would certainly be a help to know which zones have the most left for you to find, but it could be possible that you can gain the Grandmaster title without ever uncovering the true 100% in any individual zone.
For the Explorable Area lettering to turn gold when fully mapped. Therefore you could have the Grandmaster Cartographer title and still have areas that do not have gold lettering - thus wanting to go and finish the mapping of those area for any perfectionists.
I think if you're going for a title, you shouldn't complain how hard it is. They are made to be difficult, some more so than others, so I'm against making any of them easier(reducing beer prices, making exploration easier, making rares drop more, etc). If you want a title, earn it, don't try to make it easier.
/notsigned Titles need to be hard to get. We already have a good-sized buffer on this title making a true 100% unnecessary, no need to make it even easier.
There is absolutely no rational reason not to do this.
The "hardness" of the title should be in being able to explore every inch of the map whilst not dying before getting there.
The hardness should not be based on "My eyes are better at pixel-hunting fog than yours are therefore I deserve 100% whilst you are stuck at 97.2%". --- Which is how the game "works" currently.
I feel for the people who already earned their title, but it seems silly that I should have to open up photoshop and hunt for bits and pieces of fog. I'm at 98.4% and I'm about ready to give up. Without outside utilities, this title is damned near impossible thanks to the need for wall hugging.