_x11 = 1517;
_x12 = 1217;
_y11 = 1572;
_y12 = 1272;

while {true} do
{
	_list = ( (allMissionObjects "AllVehicles") + (allMissionObjects "Man") );

	{
		_posX = getpos _x select 0;
		_posY = getpos _x select 1;
		
		if ( (_posX < _x11 && _posX > _x12) && (_posY < _y11 && _posY > _y12) ) then
		{
			// write you code here
		};
	} forEach _list;

	sleep 2;
};