Is it legal to carry firearms on ships in international waters?

Yes, it is generally legal to carry firearms on ships in international waters, but the regulations can vary based on the ship's flag state and the laws of the countries involved. Ship owners must comply with the laws of the flag state under which the ship is registered, and they should also consider the laws of any ports they may enter. Additionally, specific maritime security regulations, such as those related to piracy, may influence the carrying of firearms on vessels.