Editing Goalkeeper CIWS (section)

===Target engagement===
[[File:Goalkeeper CIWS target.jpg|thumb|200px|left|A target hit by the Goalkeeper. This target was hit six times in a one-second burst of 70 rounds.]]
The [[GAU-8 Avenger|GAU-8/A Avenger]] [[30 mm caliber|30 mm]], also used by the [[A-10 Thunderbolt II]] aircraft, was selected for the system.  The 30x173mm cartridge has a greater projectile mass than the 20x102mm cartridge fired by the [[Phalanx CIWS]] [[M61 Vulcan]], so it provides much greater destructive power and significantly increased range with similar muzzle velocity.

The 30x173mm MPDS cartridge has a discarding nylon sleeve ([[Sabot (firearms)|sabot]]) with a 21&nbsp;mm sub-calibre [[tungsten]] penetrator.  The nylon sabot provides a seal between penetrator and barrel and reduces wear.

The tracking radar is capable of monitoring the line of fire and commanding minor adjustments.

[[Supersonic]] missiles that are damaged may still have enough momentum to hit the ship—the only way to ensure the protection of the ship is either to detonate the warhead of the missile or obliterate the missile.

The system's reaction time to a [[Mach number|Mach 2]] [[Sea skimming|sea-skimming]] missile such as the Russian [[SS-N-22|SS-N-22 Sunburn]] from automatic detection to kill is reported to be 5.5 seconds with the firing synchronized to start the engagement at a range of 1,500&nbsp;m and ending with a kill at 300&nbsp;m.<ref name=rnn/>