Reference Line : A fictive line displayed on the radar screens in VTS Centres and/or electronic sea-charts separating the fairway for inbound and outbound vessels so that they can safely pass each other
International Maritime Organization (IMO) Sub-Committee on Safety of Navigation & Rijeka College of Maritime Studies, IMO Standard Marine Communication Phrases (SMCP), London, UK 2000. http://www.segeln.co.at/media/pdf/smcp.pdf, (Mrn Commun Phrases - Brit) {563}