 The SPN-500s carried a rangefinder as well as Yakor (NATO designation Sun Visor) fire-control radar.Air search capability was provided by the Fut-N (NATO designation Slim Net) radar with anti-aircraft fire control provided by Fut-B (NATO designation Hawk Screech) radars.The main air-search radar was the Giuis-2 (NATO designation Cross Bird), a Soviet development of the wartime British Type 291 radar.