In a foreign part what reference would you use to find ATON?

• A. List of Lights
• B. Light List
• C. Nautical Almanac
• D. Coast Pilot

Answer: (A)

ATON refers to navigational aids like lighthouses, buoys, and signals. In a foreign part, you would use the List of Lights because it catalogs all aids to navigation for a given region, with details such as position, light characteristics, range, and timing. This makes it the standard reference for locating ATON outside U.S. waters. The Light List is U.S.-specific and covers lights within U.S. waters and approaches, so it wouldn’t cover foreign ports. The Nautical Almanac deals with celestial data and astronomical timing, not locations of aids to navigation. The Coast Pilot provides U.S. coastal pilotage information, not a foreign ATON catalog. So the List of Lights is the appropriate reference for finding ATON in foreign parts.