Cartographer
Cartographer is a WoW addon that enhances the usage of current world map. It allows you to view battleground, city and instance maps outside your current zone, adds coordinates of your character's current location and the cursor. It supports map zooming, transparency, scaling and notations.
The addon also shows unexplored zone areas as well as other zone information such as the level range, the list of instances located in the zone and the types of instance (5, 10, 25 or 40-man).