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diff --git a/game/server/cstrike/cs_nav_mesh.h b/game/server/cstrike/cs_nav_mesh.h
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+++ b/game/server/cstrike/cs_nav_mesh.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+// cs_nav_mesh.h
+// The Navigation Mesh interface
+// Author: Michael S. Booth ([email protected]), January 2003
+
+//
+// Author: Michael S. Booth ([email protected]), 2003
+//
+// NOTE: The Navigation code uses Doxygen-style comments. If you run Doxygen over this code, it will 
+// auto-generate documentation.  Visit www.doxygen.org to download the system for free.
+//
+
+#ifndef _CS_NAV_MESH_H_
+#define _CS_NAV_MESH_H_
+
+#include "filesystem.h"
+
+#include "nav_mesh.h"
+
+#include "cs_nav.h"
+#include "nav_area.h"
+#include "nav_colors.h"
+
+class CNavArea;
+class CCSNavArea;
+class CBaseEntity; 
+
+//--------------------------------------------------------------------------------------------------------
+/**
+ * The CSNavMesh is the global interface to the Navigation Mesh.
+ * @todo Make this an abstract base class interface, and derive mod-specific implementations.
+ */
+class CSNavMesh : public CNavMesh
+{
+public:
+	CSNavMesh( void );
+	virtual ~CSNavMesh();
+
+	virtual CNavArea *CreateArea( void ) const;							// CNavArea factory
+
+	virtual unsigned int GetSubVersionNumber( void ) const;									// returns sub-version number of data format used by derived classes
+	virtual void SaveCustomData( CUtlBuffer &fileBuffer ) const;							// store custom mesh data for derived classes
+	virtual void LoadCustomData( CUtlBuffer &fileBuffer, unsigned int subVersion );			// load custom mesh data for derived classes
+
+	virtual void Reset( void );											///< destroy Navigation Mesh data and revert to initial state
+	virtual void Update( void );										///< invoked on each game frame
+
+	virtual NavErrorType Load( void );									// load navigation data from a file
+	virtual NavErrorType PostLoad( unsigned int version );				// (EXTEND) invoked after all areas have been loaded - for pointer binding, etc
+	virtual bool Save( void ) const;									///< store Navigation Mesh to a file
+
+	void ClearPlayerCounts( void );										///< zero player counts in all areas
+
+protected:
+	virtual void BeginCustomAnalysis( bool bIncremental );
+	virtual void PostCustomAnalysis( void );							// invoked when custom analysis step is complete
+	virtual void EndCustomAnalysis();
+
+private:
+};
+
+#endif // _CS_NAV_MESH_H_