diff --git a/SQF/dayz_code/compile/fn_inAngleSector.sqf b/SQF/dayz_code/compile/fn_inAngleSector.sqf
index 242d75bba..bcc6033df 100644
--- a/SQF/dayz_code/compile/fn_inAngleSector.sqf
+++ b/SQF/dayz_code/compile/fn_inAngleSector.sqf
@@ -1,37 +1,30 @@
-//------------------
-// Authors: Peter Morrison (snYpir) & Philipp Pilhofer (raedor)
-// Purpose: Checks if a position lies within an angle sector
-// Arguments: [<center position>,<center angle of sector>,<sector width>,<position>]
-// Return: boolean
+///////////////////////////////////////////////////////////////////////////////////////////////////
 //
-/*
-	Returns true if <position> lies within the sector defined by <center position>,
-	<center angle of sector> and <sector width>. Use this function to determine if
-	a position lies within a certain angle from another position (ie the <center position>).
-	Example:
-	[position player,getdir player,30,position enemy_tank] call BIS_fnc_inAngleSector
-	will return true if the vehicle named enemy_tank is within 30 degrees of where the player is pointing.
-*/
-// Revision History:
-// 09/01/08 0.1 - First cut VBS2
-//------------------
-private["_small","_large","_xpos","_ypos","_dir2","_dir3"];
+//	Purpose: Checks if a position lies within an angle sector
+//	Arguments: [<center position>, <center angle of sector>, <sector width>, <position>]
+//	Return: boolean
+//
+//	Returns true if <position> lies within the sector defined by <center position>,
+//	<center angle of sector> and <sector width>.
+//
+//	Example:
+//	[position player, getDir player, 30, position enemy_tank] call BIS_fnc_inAngleSector
+//	will return true if the vehicle named enemy_tank is within 30 degrees of where the player is pointing.
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////
+//
+//	Optimized for 1.0.7.1
+//
+//	Transpose the rightmost radial arm to 0 degrees and calculate target direction
+//	using CCW trig convention. Keep sector width to < 180 degrees when calling this function.
+//
+///////////////////////////////////////////////////////////////////////////////////////////////////
+local _source	= _this select 0;					// center position
+local _width	= _this select 2;					// sector width
+local _target	= _this select 3;					// target position
+local _px	= (_target select 0) - (_source select 0);		// x relative
+local _py	= (_target select 1) - (_source select 1);		// y relative
+local _dir	= -(_px atan2 _py) + 360;				// get CCW relative angle from x,y coords
+local _relDir	= (_dir + (_this select 1) + (_width * 0.5)) % 360;	// transpose target direction by source direction plus half angle sector
 
-_r = false;
-
-_small = (_this select 1) - ((_this select 2) / 2);
-_large = (_this select 1) + ((_this select 2) / 2);
-
-_xpos = ((_this select 3) select 0) - ((_this select 0) select 0);
-_ypos = ((_this select 3) select 1) - ((_this select 0) select 1);
-
-_dir1 = _xpos atan2 _ypos;
-
-if (_dir1 < 0) then {_dir1 = _dir1 + 360};
-
-_dir2 = _dir1 - 360;
-_dir3 = _dir1 + 360;
-
-if ((_dir1 >= _small && _dir1 <= _large) || (_dir2 >= _small && _dir2 <= _large) || (_dir3 >= _small && _dir3 <= _large)) then {_r = true};
-
-_r
+_relDir <= _width							// is target in angle sector?