Aid to navigation (AtoN) : A device or system external to vessels that is designed and operated to enhance the safe and efficient navigation of vessels, or vessel traffic
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}