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The Map found in DayZ
The Maps are tools used for navigation in DayZ game world. There are a number of different maps, showing topographic view of different areas of Chernarus. Which can be accessed using the 'M' key by default.
You can also use the Map to mark locations with a double-click of the left mouse button where you want to mark, then labeling it. This can be used to mark where useful supplies, camps, and specific buildings and structures are. One could even go as far as to mark meeting places if a group of survivors wanted to meet up, thus being able to scope out the place beforehand.
There are a few servers that, along with other useful loot, spawn you with a Map. They may either say it in the server name, or it has to be joined to find out.
Maps are one of the most sought after items in the game, as they show the entire game world and can be used to roughly show the players position by cross referencing an in-game landmark like a town, with the same location on the map. Some servers will show the player's exact position with just a Map, thereby making the GPS nearly useless.
Maps paired with a Compass can be very good for town-to-town navigation and can tell you in which direction you're heading. Compasses are also displayed on the map, showing which direction you are facing.
The Map does not take up usual inventory slots, but goes instead into the tool slots below the sidearm slot. However, they use one inventory slot when stored in the backpack.