Goalkeeper, Phalanx, and the cost of close defence

The preference for Goalkeeper rests on its 30 mm weapon's perceived advantages over Phalanx's 20 mm installation. The cited firing rates are 4,200 and 4,500 rounds per minute respectively, with listed effective ranges of 3,500 and 2,600 metres. Goalkeeper is nearly four tonnes heavier and holds 1,200 rounds against Phalanx's 1,550 in this comparison, prompting a wish for more ammunition storage. Higher muzzle velocity is another claimed advantage, alongside equal elevation and 360-degree traverse. Its installation requires some deck penetration, and it has automatic engagement with its own fire-control system. Greater Phalanx production could help explain its lower price. The procurement argument favours paying more for close defence when the warship costs hundreds of millions of pounds and the perceived performance difference could matter. The performance figures support a preference within this comparison, without establishing a universal choice for every ship.