What ATON system is used on Western rivers?

The U.S. ATON (Aids to Navigation) System is specifically designed to cater to the unique needs of navigational efforts across various waterways in the United States, including the Western rivers. This system incorporates a range of aids such as buoys, beacons, and lighthouses that help mariners safely navigate inland and coastal waterways.

The Western rivers, which often involve a mix of challenging conditions such as swift currents and fluctuating water levels, require a comprehensive navigation system that is aligned with U.S. standards. The U.S. ATON System is governed by the U.S. Coast Guard, which ensures that the aids remain effective, standardized, and suited for safe navigation in these specific environments.

Understanding that there are different systems in other contexts, such as the International ATON System which standardizes navigational aids globally, or the Eastern ATON System which may cater to different regions or jurisdictions, is important. However, the U.S. ATON System is distinct in its focused approach to navigation within the United States, particularly in the varied waterways found in the West. This makes it the correct answer regarding the ATON system utilized on Western rivers.