Prudonce : A marine radio signal which is used to advise that complete silence is no longer needed on a frequency being used for distress traffic, and that restricted working may be resumed with caution
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}