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ECDIS Limitations, Data Reliability, Alarm Management and Safety Settings Recommended for Passage Planning and Route Monitoring on VLCC Tankers

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The purpose and scope of this paper is to describe the factors to consider when determining Electronic Chart Display and Information System (ECDIS) limitation, data reliability, alarm management and ship’s safety parameter settings. For the optimum situational awareness, navigators must always recognize the level of display for objects presented when using ECDIS. The values for the safety depth and safety contour must be understood and entered to achieve a sensible and considered meaning and alarm settings. The navigators must remember that the display of underwater obstructions or isolated danger symbols can change according to the settings of this safety contour which also marks the division between navigable (safe) and non-navigable (unsafe) water. Improper management of the system may result in the anti-grounding alarms and other indications failing to activate as required for the safe conduct of the navigation. Consequently, it could give a false impression of safe waters around the vessel where some dangers may not be shown due to the limitations imposed by original chart scale. This paper recognizes the limitations of ECDIS display, the significance of appropriate safety settings as well as the alarm management recommended for passage planning & route monitoring on VLCC tankers.
  • Teekay Learning and Development Center, Manila, Philippines
  • Teekay Shipping, Norway
  • 1. IHO’s ‘Regulation of the IHO for International charts and charts specification of the IHO’s white paper.’ Zones of Confidence taken from: ttps://
  • 2. IMO Resolution A.817(19): Performance Standards for Electronic Chart Display and Information Systems (ECDIS). Available at:
  • 3. IMO Resolution MSC.1/Circ.1503/Rev.1, ECDIS – New guidance for good practice (2017-06-16)
  • 4. IMO Resolution MSC.232(82) adopted on 5 December 2006: Adoption of The Revised Performance Standards for Electronic Chart Display and Information Systems (ECDIS). Available at:
  • 5. IMO Resolution MSC. Circ.1391, Operating Anomalies Identified within ECDIS (2010-12-07).
  • 6. IMO Safety of Navigation SN. Circ.266 Rev 1. Maintenance of ECDIS (22 Oct 2007).
  • 7. Teekay internal document No.: SP1915 v.2, Navigational Handbook, (2017-02-28).
  • 8. Teekay internal document No.: RF1112 v.3, ECDIS - Category Zone of Confidence (CATZOC).
  • 9. Teekay internal document No.: RF1113 v.5, ECDIS Navigation (General, Technical & Safety Information), March 2018.
  • 10. Weintrit, A. 2009, The Electronic Chart Display and Information System (ECDIS). An Operational Handbook. A Balkema Book. CRC Press, Taylor & Francis Group. ISBN: 9780415482462.
  • 11. Weintrit A.: Reliability of Navigational Charts and Confidence in the Bathymetric Data Presented. Scientific Journals of the Maritime University of Szczecin, No. 54 (126), pp. 84–92, 2018. - doi:10.17402/289
  • 12. Weintrit A.: Accuracy of Bathymetric Data in the Electronic Navigational Charts. Scientific Journals of the Maritime University of Szczecin, No. 55 (127), pp. 60-69, 2018 - doi:10.17402/302
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
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