Navigation Quiz 1

• Navigational warnings


  Messages disseminated to seafarers to alert them to potential hazards or dangers in navigable waters
• Navigational warnings


  • They are crucial for promoting maritime safety and ensuring that vessels can navigate with awareness of any obstacles, hazards, or other navigational concerns that may affect their voyage
• Information included in navigational warnings


  • Navigational Hazards
  • Weather Conditions
  • Maritime Events
  • Security Concerns
• Categories of radio navigational warnings

  • NAVAREA Warnings
  • METAREA Warnings
  • Coastal Warnings
  • Local Navigational Warnings
  • Ice Navigational Warnings
  • Tropical Cyclone Warnings
  • Broadcast Notices to Mariners (NMs)
• NAVAREA Warnings


  Provide information on hazards to navigation that may affect multiple maritime zones within a particular area
• METAREA Warnings


  Provide meteorological information for specific oceanic regions
• Coastal Warnings


  Issued for specific coastal areas and include information on hazards such as wrecks, obstructions, changes in navigational aids, and other local conditions that may affect safe navigation near the coastline
• Types of Coastal Warnings

  • Gale Warning
  • Coastal Flood Warning
• Local Navigational Warnings


  Issued for specific waterways, ports, or harbors and provide detailed information on local hazards, navigational restrictions, temporary obstructions, and other relevant conditions
• Examples of Local Warnings

  • Rainfall and Thunderstorm Warning
  • Seismic Hazard Assessment
  • Tsunami Warnings
  • Storm Surge Information
  • Flood Forecasting and Warning System
• WWNWS (World-wide Navigation Warning Service) guidance and co-ordination are involved with only NAVAREA and Coastal Warnings and, of the latter, only with those Coastal Warnings which are broadcast under the internationally coordinated services using NAVTEX, or in lieu of NAVTEX, the International Safety NET service, as their principal means of transmission
• Ice Navigational Warnings


  Provide information on the presence, extent, and movement of icebergs, ice floes, and other ice-related hazards
• Tropical Cyclone Warnings


  Provide information on the development, movement, and intensity of tropical cyclones (hurricanes, typhoons) that pose a threat to maritime navigation
• Broadcast Notices to Mariners (NMs)


  Provide important updates to navigational charts and publications, informing mariners about changes in navigational aids, harbor regulations, and other relevant information
• Methods of transmitting navigational warnings

  • Navtex (Navigational Telex)
  • Radio Broadcasts
  • Electronic Chart Display and Information Systems (ECDIS)
  • Online Platforms and Websites
  • Notice to Mariners
  • Inmarsat-C
• Navtex (Navigational Telex)


  An international automated system for broadcasting maritime safety information, including navigational warnings, to ships
• Inmarsat-C


  A two-way, packet data service operated by the telecommunications company Inmarsat which operates between mobile earth stations (MES) and land earth stations (LES)