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All About Nautical Charts Tutorial: References

All links are accurate and live at time of publication.

Bowditch, N. (1906). American practical navigator (No. 9). US Navy Hydrographic Office under the authority of the Secretary of the Navy. 

Gill, S.K., & Schultz, J.R. (2001). Tidal datums and their applications. Silver Spring MD, NOAA, NOS Center for Operational Oceanographic Products and Services, 102pp. & Appendix. (NOAA Special Publication NOS CO-OPS 1). DOI: http://dx.doi.org/10.25607/OBP-170

National Oceanic and Atmospheric Administration. (1975, July). Chart No. 1 United States of America Nautical Chart Symbols Abbreviations and Terms 13th Edition. Available at https://nauticalcharts.noaa.gov/publications/docs/us-chart-1/ChartNo1.pdf, accessed on 10/13/2023.

National Oceanic and Atmospheric Administration. (2025, July 29). NOAA Digital Collections: Projects. Available at https://www.noaa.gov/digital-collections, accessed on 8/31/2023.

National Oceanic and Atmospheric Administration. (2022, June 9). Story map: Our dynamic marine economy. Available at https://www.noaa.gov/stories/story-map-our-dynamic-marine-economy, accessed on 4/22/2025.

NOAA Center for Operational Oceanographic Products and Services. (n.d.). National Tidal Datum Epoch. Available at https://tidesandcurrents.noaa.gov/datum-updates/ntde/, accessed on 4/1/2025.

NOAA Center for Operational Oceanographic Products and Services. (n.d.). Tidal datums. Available at https://tidesandcurrents.noaa.gov/datum_options.html, accessed on 4/1/2025.

NOAA Center for Operational Oceanographic Products and Services. (2000, June). Tidal datums and their applications. Available at https://tidesandcurrents.noaa.gov/publications/tidal_datums_and_their_applications.pdf, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). Boundary currents. Available at https://oceanservice.noaa.gov/education/tutorial_currents/04currents3.html, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). Do we still need lighthouses? Available at https://oceanservice.noaa.gov/facts/lighthouse.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). How do we make nautical charts? Available at https://oceanservice.noaa.gov/navigation/making-nautical-charts.html, accessed on 1/8/2024.

NOAA National Ocean Service. (n.d.). How does backscatter help us understand the sea floor? Available at https://oceanservice.noaa.gov/facts/backscatter.html, accessed on 7/31/2024.

NOAA National Ocean Service. (1997). Nautical Chart User’s Manual. Available at https://repository.library.noaa.gov/view/noaa/49555, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). Tidal currents 2. Available at https://oceanservice.noaa.gov/education/tutorial_currents/02tidal2.html, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). Tides and water levels. Available at https://oceanservice.noaa.gov/education/tutorial_tides/, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). What’s the difference between a nautical chart and a map? Available at https://oceanservice.noaa.gov/facts/chart_map.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What do the numbers mean on a nautical chart? Available at https://oceanservice.noaa.gov/facts/sounding.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What is a datum? Available at https://oceanservice.noaa.gov/education/tutorial_geodesy/geo04_datums.html, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). What is a historical map or chart? Available at https://oceanservice.noaa.gov/facts/historicchart.html, accessed on 1/5/2024.

NOAA National Ocean Service. (n.d.). What is a nautical chart? Available at https://oceanservice.noaa.gov/facts/nautical_chart.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What is a tide gauge? Available at https://oceanservice.noaa.gov/facts/tide-gauge.html, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). What is hydrography? Available at https://oceanservice.noaa.gov/facts/hydrography.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What is latitude? Available at https://oceanservice.noaa.gov/facts/latitude.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What is longitude? Available at https://oceanservice.noaa.gov/facts/longitude.html, accessed on 10/13/2023.

NOAA National Ocean Service. (n.d.). What is sonar? Available at https://oceanservice.noaa.gov/facts/sonar.html, accessed on 4/1/2025.

NOAA National Ocean Service. (n.d.). Where do I get NOAA nautical charts? Available at https://oceanservice.noaa.gov/facts/find-charts.html, accessed on 1/5/2024.

NOAA Ocean Exploration. (2020, June 22). Multibeam Sonar. Available at https://oceanexplorer.noaa.gov/technology/sonar-multibeam/, accessed on 4/1/2025.

NOAA Ocean Exploration. (2020, June 22). Side-Scan Sonar. Available at https://oceanexplorer.noaa.gov/technology/sonar-side-scan/, accessed on 4/1/2025.

NOAA Ocean Exploration. (2020, June 22). Sonar. Available at https://oceanexplorer.noaa.gov/technology/sonar/, accessed on 1/5/2024.

NOAA Ocean Exploration. (n.d.). Sonar: Seeing with Sound. Available at https://oceanexplorer.noaa.gov/wp-content/uploads/2025/04/sonar-fact-sheet.pdf, accessed on 5/12/2025.

NOAA Ocean Exploration. (n.d.). Split-beam Sonar. Available at https://oceanexplorer.noaa.gov/technology/sonar-split-beam/, accessed on 5/12/2025.

NOAA Ocean Today. (n.d.). The Ocean Shows Us the Way. Available at https://oceantoday.noaa.gov/oceanshowsusway/, accessed on 3/4/2024.

NOAA Office of Coast Survey. (n.d.). NOAA ENC - Electronic Navigational Charts. Available at https://nauticalcharts.noaa.gov/charts/noaa-enc.html, accessed on 4/22/2025.

NOAA Office of Coast Survey. (n.d.). Hydrographic Survey Equipment. Available at https://nauticalcharts.noaa.gov/learn/hydrographic-survey-equipment.html, accessed on 7/31/2024.

NOAA Office of Coast Survey. (n.d.). Navigate with Confidence. Available at https://www.nauticalcharts.noaa.gov/, accessed on 4/22/2025.

NOAA Office of Coast Survey. (n.d.). Ocean Mapping Capabilities. Available at https://www.nauticalcharts.noaa.gov/about/docs/about/ocean-mapping-capabilities.pdf, accessed on 12/6/2024.

NOAA Office of Coast Survey. (n.d.). Rescheming and Improving Electronic Navigational Charts. Available at https://www.nauticalcharts.noaa.gov/charts/rescheming-and-improving-electronic-navigational-charts.html, accessed on 4/22/2025.

NOAA Office of Coast Survey. (n.d.). Survey Vessels. Available at https://www.nauticalcharts.noaa.gov/about/survey-vessels.html, accessed on 5/12/2025.

NOAA Office of Coast Survey. (n.d.). What are ENCs? Available at https://nauticalcharts.noaa.gov/charts/noaa-enc.html, accessed on 4/22/2025.

O’Neill, Kathryn. Personal interview. 5 Feb. 2026. [1]

Shea, Eileen L. (1987.) A History of NOAA: Being a Compilation of Facts and Figures Regarding the Life and Times of the Original Whole Earth Agency. Available at https://www.noaa.gov/sites/default/files/2025-07/shea_history_NOAA.pdf, accessed on 5/22/2025.

Woods Hole Oceanographic Institution. (n.d.). Sonar Single Beam. Available at https://www.whoi.edu/ocean-learning-hub/ocean-topics/ocean-tech/acoustics/sonar-single-beam/, accessed on 5/12/2025.