Non follow up is a type of steering control. Non follow up system directly controls direction control valves of the HPU. Therefore it is the simplest and safest way of control. When joystick is pushed to one side, rudder starts turning to this direction and turns as long as joystick is pushed or tiller reaches to limit siwitch. Rudder stays at the position where joystick is released. To take the rudder at center, joystick must be pushed in the opposite direction.