So I don't even know if it's possible. But i've had a few people asking about this recently.

So obviously in Classic there is no Dungeon maps. However in Retail there is. Now the layout of the Dungeons hasn't changed, only really the boss position! So the maps are relevant to a certain degree.

Would it be possible to show the map from Retail when you press (M) inside a Dungeon? I know TomCat did it a while ago but I'm unsure if the code has changed so much that its not even possible anymore. I think it would be a huge feature and people would appreciate it a lot, even if you can't see yourself on the map.

Hey,
it's not too hard to override the map when inside the instance, I also saw at least a few addons over the years doing that, but the problem would be more that you wouldnt see the players on the map, and more importantly you would need the map files; I dont think the instance maps are in the classic client (but havnt checked) - if not, they would add a lot to the filesize (its that important, and atm at like 9mb, but I dont want to have like 20-30mb or more)

The map is one part I havnt touched at all, but I will look into it at some point, but atm I'm using LeatrixMaps and I wont try to compete with so many features from another addon. I would add styling, and stuff like coordinates etc, but not really more as its a bit out of scope. I'm doing 99% of the work alone, and cant really afford to spend that much more time on minor/out of scope features.