This page covers the Mod version of DayZ. For information on the Standalone see Map
1 Tool slot
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A map of Chernarus can be found as Loot ingame which then can be accessed using the M key by default. Maps are one of the most sought after items in the game. They don't use up usual Inventory slots, but go into the tool slots below the sidearm slots. However, they use 1 inventory slot when stored in the backpack.
See list of Locations (with Russian city names)