What is CIWS? Thanks.
It is Close in Weapon System.
The way Steve has it set up it is a self contained point defense gauss cannon turret. It mounts two gauss cannon with a 50% base to hit chance, beam fire control and an active sensor to detect missiles, and if you want eccm as well. All of it is shrunk down to a system that is 6-8 hull size total. It only defends the mounting ship against missiles however, it will not protect any other ships, nor can it be used against an enemy ship. It is very handy for a backup point defense, especially on missile ships which don't have the tonnage for a regular point defense set up. As a basic point defense setup would otherwise be at least 4hs for the fire control, .5hs for the active sensor, and between 3-6hs for the weapon in a turret. Even on beam ships it is not a bad idea to put one or two on as they are totally self-contained and a lucky hit on your point defense fire control does not leave you defenceless against missile attacks
Brian