[4] During development, the Navy Weapons Agency aimed to achieve blind shooting and high-precision interception capabilities for targets that take evasive action within 4,000 yards (3,700 m).

Similar to the late model of Mk.51, it is a human-operated GFCS centered on the disturbed-line-of-sight systems Mk.15 (later improved Mk.29) gun sight.

[5] Initially, S-band Mk.28 and later X-band Mk.34 were used as radars,[6] and they were installed on turrets and mounts, but the beam width was too narrow and it was difficult to capture targets.

By moving the antenna up and down 20 degrees to make it easier to capture the target by swinging the beam (notting mechanism), measures were taken.

[7] In AN/SPG-34, the knotting mechanism was removed due to the improved target acquisition capability, and instead, like AN/SPG-35 in Mk.56 GFCS, conical scanning that quickly measures and distances with a narrow beam width.