The Dark Zone map is developed by Michael Lynch (Gamegenius86) and you can find it here. Initially, the fan has released his map through the Reddit thread here. Now the place has become a hub for a feedback and different ideas.
The map itself is incredibly useful. It provides information about the position of Bosses, Chest, Safe Houses, and so on. Of course, the main feature of the map is the ability to plan a route and share it with friends!