Working Channel or Frequency : The channel (for VHF) or frequency (for MF/HF) on which marine radio communications are carried out after initial contact has been established on the calling frequency or channel
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}