If you have not got at least one rank in this skill then you cannot be an effective member of a ship's weapon team. If you join a ship's weapon team without having this skill your presence adds one round to the reload time. If you shoot a ship's weapon you will suffer a -4 penalty on attack rolls, with or without this skill.
Ship Weapon Use [General]
You can use all ship's weapons effectively.
Prerequisites: having at least one rank in Profession (siege engineer).
Benefit: You make attack rolls with the weapon normally, i.e. you get to add your BAB and Dex bonus, and there are no penalties for lack of proficiency or weapons size.
Normal: A character who uses a ship's weapon without this feat suffers a -4 penalty on attack rolls.
Weapon Focus [General]
This feat can be taken for a specific class of ship's weapon (catapult, ballista, bombard, greek fire projector or jettison) as long as you also have the Ship Weapon Use feat. This feat can be taken several times selecting a different ship's weapon each time.
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