Not exactly sure what you mean by "check against the default world map"? I don't even remember if the default world map has sub-zones marked (I assume it does) ...
It means check with the not-Cartographer map, and see if the results are any different. Don't assume anything, but try to figure out if what you're asking for is a bug fix, a new feature that involves a little adjustment to the code, or for some sap to get a lot of information from Allakhazam and use it to build a completely new module that hardcodes every subzone in the game and correlates it to mouse positions over the world map frame.
saltorio, you may wanna check against the default world map, too. HFP is where I found a few dead zones (and the rest of the Outlands ... well it's all blank to me anyway. :P) Again, I'm not saying anything definitive but my observations match that idea 100% - so far.
Not exactly sure what you mean by "check against the default world map"? I don't even remember if the default world map has sub-zones marked (I assume it does) though there should be no real correlation between what sub-zones it has marked compared to Cartographer. Cartographer is supposed to be a more fully-featured version of the World Map.
I found 2 unmarked sub-zones in Blade's Edge Mountains, yesterday. Boulder'Mok and Skald (http://wow.allakhazam.com/db/zone.html?wzone=114). I had bother of these areas fully explored (ie: uncovered by the map fog), and was standing in the sub-zones (as reported by FuBar_LocationFu) when I noticed they weren't on the Cartographer map.
I'd really rather not have such sub-zones marked with any sort of map notes (as others suggested). These are sub-zones like any other. They are reported by location mods like LocationFu, and you gain experience for discovering them. As many other sub-zones are flagged in Cartographer so that if I hover my cursor over them on the map, I'll see the sub-zone name in big white text at the top of the Cartographer window, all I ask is that ALL sub-zones are labeled as such.
If the devs of Cartographer need a quick reference as to where each sub-zone is, the maps at WoW Allakhazam (as above) show them.
I'll check again tonight, but I'm pretty sure it's not showing names of zones I have discovered.
I seem to remember the Abandoned Armory in Nagrand is not listing in any way in Cart, despite having discovered the area 9and talked with the guy inside at least twice). I remember noticing that sub-zones weren't displaying in HFP as well, and one of my guildies (a level 70) mentioned one of the reasons he hasn't switched to Cart is because many areas don't seem to be labeled in any way.
But what I really want is for it simply to be included with Cartographer. In Cart, I can mouseover some areas, and it'll give me that area's name at the top of the World Map window, but others it will not. There doesn't seem to be any reason for what is included and what's not.
In MetaMap, every area was listed when you moused over it. If it's an area you can "discover" and gain XP for, it's included. This simply doesn't seem to be the case with Cartographer.
I use LocationFu. However, it only tells me the sub-zone I'm currently in.
What I want is when I look at the map, I can mouse over the map to identify every sub-zone there. That way when I am told in a quest to go to the "Abandoned Armory" in Nagrand (for example), I can actually find it on the map. Such functionality was present in MetaMap.
Currently, there are only about half of the sub-zones of any particular map labeled in Cartographer, unless there is a feature I'm missing (and I'm using every Cart module available).
I've been using Cartographer for quite a while now, and I do love it.
However one thing it seems to be lacking compared to MetaMap is more area names being included with the maps. In MetaMap, you could mouse over any area of a map, and it would always tell you what the area is. With Cartographer, much of these areas are missing from both the labels on the map itself and the mouse-over info. As such, if a quest tells you to go to "X" local, you may not be able to determine where that is without hunting on your own or looking online.
[EDIT] Just to ad a bit more info: I'm talking about each area being a place that you gain experience from discovering, and that an add-on like FuBar_LocatinFu tells you you're in. WoW Allakhazam has a good display of each area (sub-zone) in a zone on it's maps, such as: