OVERVIEW: The SA-N-4a (9M33M) GECKO is a single stage, solid-fuel, command guidance, point defense missile.

DETAILS:  The SA-N-4a is a point defense missile, with a secondary anti-surface capability. It does not  have a seeker, but is command guided via an uplink.  It uses a 14.5 kg HE  
blast/fragmentation warhead with a proximity fuse.  Associated radars are the POP GROUP.  This radar system uses a search radar (NATO H-Band), separate missile and target tracking  
radars (NATO J-Band), a capture radar and an uplink to control the missile.  After initial detection and cueing by surveillance radars, the POP GROUP target tracking radar is used  
to illuminate the target, while the missile tracking radar tracks the missile, which is guided to the target via the uplink.

Specifications: 

Range (minimum/maximum):	1.5 / 10.0 km 
Range (suface):			7.4 km
Altitude  (minimum/maximum):	25 / 5,000 m

NOTES:  IOC 1980 (approx).  The GECKO is a navalized version of the land-based SA-8.  Designed primarily for uses in ASW ships to provide a point defense capability, it was also  
used to as a secondary anti-air armament in larger ships.   

  
SOURCES:  Friedman, N., & Friedman, N. (1997). The Naval Institute guide to world naval weapon systems. Annapolis, MD: Naval Institute Press, pg. 403 ; Jane's Weapon Systems Vol. 3: Naval, "SA-N-4 'Gecko' (4K33 Osa-M)," 10 June 2013  ; 9K33 Osa - Wikipedia, the free encyclopedia. (n.d.). Retrieved April 6, 2015, from  
http://en.wikipedia.org/wiki/9K33_Osa ; http://fas.org/man/dod-101/sys/missile/row/sa-8.htm; Polmar, Norman, and Siegfried Breyer. Guide to the Soviet Navy. Annapolis, Md: Naval  
Institute Press, 1983, 384 ;





