Mayday 3 : The distress signal. This signal indicates that a ship or aircraft or person is in grave and imminent danger and immediate assistance is required
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}