Many people have never heard the terms "admiralty" or "maritime" in their lives. Admiralty law governs over any moving water that a large ship can navigate through. This also includes rivers and lakes as well as, other large areas of water. Passengers on cruise ships are governed by Maritime and admiralty laws as well. If any person aboard a cruise ship is injured or becomes ill, it is a duty of the ship's staff to provide proper medical treatment free of charge. If the unfortunate should happen and a person falls ill or sustains an injury, they should seek a cruise ship injury lawyer as soon as possible.