Aids to Navigation — Road Signs of the Waterway

Understanding and using the U.S. Aids to Navigation System is an important part of operating your boat safely.

The Aids to Navigation System is a consistent way to mark the waters of the United States and its territories to assist boaters in navigation, and alert them to obstructions and hazards. This system serves the same function as the safety signals and signs used in driving on streets and highways.

The U.S. Coast Guard is responsible for the placement and maintenance of Aids to Navigation in U.S. waters. These aids include lighted and unlighted beacons, ranges, leading lights, and buoys, as well as sound signals associated with these aids.