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How can we help?

  1. MarineTraffic Help
  2. FAQs
  3. About the Automatic Identification System (AIS)
  • What is the Automatic Identification System (AIS)?
  • What is the typical range of the AIS?
  • What kind of information is AIS-transmitted?
  • How do transmitted AIS signals get attributed to correct vessels in busy areas?
  • How is the data collected and used by MarineTraffic?
  • How often do the positions of the vessels get updated on MarineTraffic?
  • Which way is information on a vessel's flag found?
  • What is the significance of the AIS Shiptype number?
  • What is the significance of the AIS Navigational Status Values?
  • How can the vessel's crew help?
  • Why cannot I see a vessel on the Live Map?
  • Why has a vessel not reported a Port Call?
  • How can I get my vessel recorded in the MarineTraffic database and displayed on the Live Map?
  • Sometimes the Live Map icons refresh slowly or strange data appear on it. Why is that so?
  • Can the web-published information be used to enhance safety at sea?

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