NAVIGATION RULES A Must for Safe Boating in an Easy to Use Format. A proven navigation tool used by the U.S. Coast Guard, U.S. Power Squadrons, and U.S. Coast Guard Auxiliary. Navigation Rules feature U.S. Buoyage System, inland and international rules, right-of- way, lights, sound signals, and bridge signals. All presented in graphic summary and easy to read. Complete, precise, accurate.