NAV (file format)
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A NAV file is a Navigation Mesh file for Bots in Counter-Strike. It defines, among other things the walkable space in a level. The file is generated automatically when bots are played for the first time on a specific map. One can edit a Navigation Mesh manually by typing nav_edit 1 in the console with sv_cheats enabled. NAV creation is an open-source task available in the SDK. If one were to implement their bots, it would be easier because NAV creation is already supplied.
The difference between an AIN and a NAV file is that an AIN file is mainly used for NPC navigation.