diff --git a/SQF/dayz_code/compile/fn_fieldOfView.sqf b/SQF/dayz_code/compile/fn_fieldOfView.sqf
index 1d2f461c3..5f591de08 100644
--- a/SQF/dayz_code/compile/fn_fieldOfView.sqf
+++ b/SQF/dayz_code/compile/fn_fieldOfView.sqf
@@ -1,39 +1,39 @@
 // This function checks to see if a potential zombie spawn position is in the field of view of near players.
 
-private ["_isOk","_zPos","_fov","_safeDistance","_farDistance","_xasl","_eye","_ed","_deg"];
+local _zASL = +(_this select 0);	// zombie position ATL
 
-_isOk = true;
-_zPos = +(_this select 0);
-if (count _zPos < 3) exitWith {
-	diag_log format["%1::fn_fieldOfView illegal pos %2", __FILE__, _zPos];
+if (count _zASL < 3) exitWith {
+	//diag_log format["%1::fn_fieldOfView illegal pos %2", __FILE__, _zASL];
 	false
 };
-_zPos = ATLtoASL _zPos;
-_fov = _this select 1; // players half field of view
-_safeDistance = _this select 2; // minimum distance. closer is wrong
-_farDistance = _this select 3; // distance further we won't check
-_zPos set [2, (_zPos select 2) + 1.7];
+_zASL set [2, ((ATLtoASL _zASL) select 2) + 1.7];	// approximate eyePos of zombie
+
+local _isOk		= true;
+local _fov		= _this select 1;	//  30 // players half field of view
+local _safeDistance	= _this select 2;	//  10 // minimum distance
+local _farDistance	= _this select 3;	// 200 // ignore anything beyond this distance
+
+scopeName "exit";
 {
-	_xasl = getPosASL _x;
-	if (_xasl distance _zPos < _farDistance) then {
-		if (_xasl distance _zPos < _safeDistance) then {
-			_isOk = false;
-		} else {
-			_eye = eyePos _x; // ASL
-			_ed = eyeDirection _x;
-			_ed = (_ed select 0) atan2 (_ed select 1);
-			_deg = [_xasl, _zPos] call BIS_fnc_dirTo;
-			_deg = (_deg - _ed + 720) % 360;
-			if (_deg > 180) then { _deg = _deg - 360; };
-			if ((abs(_deg) < _fov) && {( // in right angle sector?
-					(!(terrainIntersectASL [_zPos, _eye]) // no terrain between?
-					&& {(!(lineIntersects [_zPos, _eye]))}) // and no object between?
-				)}) then {
+	local _pASL = getPosASL _x;		// player position ASL
+	local _dist = _pASL distance _zASL;
+
+	if (_dist < _safeDistance) exitWith {_isOk = false};	// zombie is too close
+
+	if (_dist < _farDistance) then {			// zombie is within range
+
+		local _dir = eyeDirection _x;						// only x,y coords are useful here
+		_dir = (((_dir select 0) atan2 (_dir select 1)) + 360) % 360;;		// convert vector to CW direction
+
+		if ([_pASL, _dir, _fov * 2, _zASL] call fnc_inAngleSector) then {	// zombie within player's FOV
+			local _eye = eyePos _x;
+
+			if (!(lineIntersects [_eye, _zASL]) && {!(terrainIntersectASL [_eye, _zASL])}) then {	// clear line of sight from player to zombie
 				_isOk = false;
+				breakTo "exit";
 			};
 		};
 	};
-	if (!_isOk) exitWith {false};
 } count playableUnits;
 
 _isOk
diff --git a/SQF/dayz_code/compile/fn_inAngleSector.sqf b/SQF/dayz_code/compile/fn_inAngleSector.sqf
index bcc6033df..b2573e9aa 100644
--- a/SQF/dayz_code/compile/fn_inAngleSector.sqf
+++ b/SQF/dayz_code/compile/fn_inAngleSector.sqf
@@ -8,7 +8,7 @@
 //	<center angle of sector> and <sector width>.
 //
 //	Example:
-//	[position player, getDir player, 30, position enemy_tank] call BIS_fnc_inAngleSector
+//	[position player, getDir player, 30, position enemy_tank] call fnc_inAngleSector
 //	will return true if the vehicle named enemy_tank is within 30 degrees of where the player is pointing.
 //
 ///////////////////////////////////////////////////////////////////////////////////////////////////