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Soviet Navy (similarly to the Soviet Army) required a short and medium range SAM system.
M-1 Volna with 4K90 (and later 4K91) missiles was the short range system. (SA-N-1)
It uses the same missile as the S-125 Neva (SA-3) system.
M-2 Volhov-M with 13DM missile was the medium range system. (SA-N-2)
It uses the same missile as the S-75 Desna (SA-2) system.
The NAVY was not really happy about the later system.
They wanted a lighter, single staged missile, with similar capabilities as the M-2.
This replacement was the M-11 Sthorm system (SA-N-3) with the 4K60 missile.
Its GROM (Head Lights) guidance system has one target, and 2 missile channels.
The lower two larger parabola tracks the target, similarly as the Volhov (Narrow Beam/LORO) antennas.
The upper smaller pairs track the two missile, ala KRUG/OSA.
The smaller parabola between and under of the target trackers, is the guidance command antenna for both missile channels.