Maritime law, also known as admiralty law, is a body of laws, conventions, and treaties that govern private maritime business and other nautical matters, such as shipping or offenses occurring on open water. International rules governing the use of the oceans and seas are known as the Law of the Sea.Maritime law, or admiralty law, regulates shipping, navigation, commerce, towage, recreational boating, and piracy by private entities on domestic and international waters. It covers both natural and man-made navigable waters, such as rivers and canals.If you have been injured on a cruise ship, or while working on a ship, then your claim will likely be adjudicated under maritime law.What Is the Importance of Maritime Law to Passengers? Passengers of vessels on the navigable waters of the United States also have rights under maritime law if they suffer injury or illness. The location of the accident is crucial for determining whether a claim falls under state law or maritime law.