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Author Weintrit, Adam
Affiliation Gdynia Maritime University, The Faculty of Navigation 3 Jana Pawła II Ave., 81-345 Gdynia, Poland
E-mail weintrit@am.gdynia.pl
ISSN printed 1733-8670
URI http://repository.am.szczecin.pl/handle/123456789/2476
Abstract Navigational charts are a basic source of information for seafarers. But how accurate and reliable are they? How much trust and confidence can be put in them? Unfortunately, the answer is not so simple; it is far more complicated than merely saying that one chart is accurate and reliable while another is not. However, any seafarer navigating in unfamiliar waters should have the necessary skills. It is a great challenge – some may say an impossibility – to keep the thousands of navigational charts up to date. But exactly how out of date, how inaccurate, are the chart data? Chart users will have a better idea now that the Hydrographic Office is gradually implementing a new chart feature called the Zone of Confidence (ZOC) box which replaces the Source Diagram that is currently in use on large-scale charts. Source Diagrams, and now the improved ZOCs, assist seafarers in assessing hydrographic survey data and the associated levels of risk of navigating in a particular area. According to the new edition of the International Hydrographic Organization (IHO) specifications, S-4 navigational charts will provide more information on ZOCs. The current paper discusses these new regulations.
Pages 84–92
Publisher Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie
Keywords reliability
Keywords accuracy
Keywords safety at sea
Keywords marine navigation
Keywords navigational charts
Keywords zone of confidence
Keywords source diagrams
Keywords International Hydrographic Organization (IHO)
Title Reliability of navigational charts and confidence in the bathymetric data presented
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  2. Harper, S., Wells, D. & Gunning, K. (2012) The Development of New Data Quality Visualisation Methods in Electronic Chart Information Systems and Investigation into Associated User Response. Conference Proceedings of Hydro12 organised by the Hydrographic Society Benelux (HSB) on behalf of the International Federation of Hydrographic Societies (IFHS), 12–15 November 2012, Rotterdam, the Netherlands.
  3. IHO S-4 (2017) Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO. Edition 4.7.0, International Hydrographic Organization, Monaco, July.
  4. IHO S-44 (2008) IHO Standards for Hydrographic Surveys. Special Publication S-44, 5th Edition, International Hydrographic Organization, Monaco, February.
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  6. Mellor, T. (2017) Category Zones of Confidence (CATZOC) – dispelling the myths. [Online] Available from: https://www. admiralty.co.uk/news/blogs/category-zones-of-confidence [Accessed: March 16, 2017]
  7. Prince, M. (2017) Accuracy and Reliability of Charts. AA411302. Australian Hydrographic Service [Online] Available from: http://websites.sportstg.com/get_file.cgi?id=27445 59 [Accessed: April 26, 2018]
  8. Wyllie, K., Cole, M., Froelich, G., Wilson, M., Nelson, K., Brennan, R. & Newman, T. (2017) Developing a Method to Validate the Navigational Bathymetric Database. US HYDRO, Galveston, Texas USA, 20 March.
ISSN on-line 2392-0378
Language English
Funding No data
Figures 4
Tables 1
DOI 10.17402/289
Published 2018-06-27
Accepted 2018-04-24
Recieved 2018-02-07

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