diff --git a/public/coordsize.h b/public/coordsize.h
new file mode 100644
index 00000000..5bf9768f
--- /dev/null
+++ b/public/coordsize.h
@@ -0,0 +1,98 @@
+//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#ifndef COORDSIZE_H
+#define COORDSIZE_H
+#pragma once
+
+#include "worldsize.h"
+
+// OVERALL Coordinate Size Limits used in COMMON.C MSG_*BitCoord() Routines (and someday the HUD)
+#define	COORD_INTEGER_BITS			14
+#define COORD_FRACTIONAL_BITS		5
+#define COORD_DENOMINATOR			(1<<(COORD_FRACTIONAL_BITS))
+#define COORD_RESOLUTION			(1.0/(COORD_DENOMINATOR))
+
+// Special threshold for networking multiplayer origins
+#define COORD_INTEGER_BITS_MP		11
+#define COORD_FRACTIONAL_BITS_MP_LOWPRECISION 3
+#define COORD_DENOMINATOR_LOWPRECISION			(1<<(COORD_FRACTIONAL_BITS_MP_LOWPRECISION))
+#define COORD_RESOLUTION_LOWPRECISION			(1.0/(COORD_DENOMINATOR_LOWPRECISION))
+
+#define NORMAL_FRACTIONAL_BITS		11
+#define NORMAL_DENOMINATOR			( (1<<(NORMAL_FRACTIONAL_BITS)) - 1 )
+#define NORMAL_RESOLUTION			(1.0/(NORMAL_DENOMINATOR))
+
+// this is limited by the network fractional bits used for coords
+// because net coords will be only be accurate to 5 bits fractional
+// Standard collision test epsilon
+// 1/32nd inch collision epsilon
+#define DIST_EPSILON (0.03125)
+
+// Verify that coordsize.h and worldsize.h are consistently defined
+#if (MAX_COORD_INTEGER != (1<<COORD_INTEGER_BITS) )
+#error MAX_COORD_INTEGER does not match COORD_INTEGER_BITS
+#endif
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+// The following are Bit Packing Diagrams for client/server Coordinate BitField Messages
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//							"Coordinates" = +/-16384.9375	(21 Bits Max)
+//
+// | IntegerFlagBit:1 | FractionFlagBit:1 | SignBit:1 | IntegerField:14 | FractionPart:4 |		Total		
+// --------------------------------------------------------------------------------------------------
+//			0					0				-				-				-				2
+//			0					1				x				-				xxxx			7
+//			1					0				x		xxxxxxxxxxxxx			-				17
+//			1					1				x		xxxxxxxxxxxxx			xxxx			21
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//							"Vec3Coordinate" = Up to 3 Coordinates (66 Bits Max)
+//
+// | NonZeroX:1 | NonZeroY:1 | NonZeroZ:1 |  0..3 "Coordinates"	|	BitField Total
+// -------------------------------------------------------------------------------
+//			0			0				0			-					3
+//			0			0				1			7..21 Bits			10..24
+//			0			1				0			7..21 Bits			10..24
+//			1			0				0			7..21 Bits			10..24
+//			0			1				1			14..42 Bits			17..45
+//			1			1				0			14..42 Bits			17..45
+//			1			0				1			14..42 Bits			17..45
+//			1			1				1			21..63 Bits			24..66
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+// The following are Bit Packing Diagrams for client/server Normal BitField Messages
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//							"Normals" = +/-1.0	(12 Bits Total)
+//
+// The only gotcha here is that normalization occurs so that 
+// 011111111111 = +1.0 and 1111111111111 = -1.0
+//
+// | SignBit:1 | FractionPart:11 |		Total		
+// --------------------------------------------------------------------------------------------------
+//			1		xxxxxxxxxxx			12
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//							"Vec3Normal" = Up to 3 Coordinates (27 Bits Max)
+//
+// | NonZeroX:1 | NonZeroY:1 |  0..2 "Coordinates"	| Z Sign Bit |	BitField Total
+// -------------------------------------------------------------------------------
+//			0			0				-					x			3
+//			0			1			12 Bits					x			14
+//			1			0			12 Bits					x			14
+//			1			1			24 Bits					x			27
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#endif // COORDSIZE_H