DOT: US Coast Guard Navigation Center
"Here you will find information about Navigation Rules, also known as the Rules of the Road or the Nav Rules. To view of any of the Navigation Rules text, click on the Navigation Rules Online link in the left-hand menu.

These rules are broken down into International Rules and Inland Rules. The International Rules are applicable on waters outside of established navigation lines of demarcation. The lines are called COLREGS Demarcation Lines and delineate those waters upon which mariners shall comply with the Inland and International Rules."