Chart Datum, Water level and Currents Working Group (CDWCWG)

“To implement a common reference system, S-104 and S-111 in the Baltic Sea”

Photo: Chart Datum, Water level and Currents Working Group 3rd meeting, 24-25 March 2026, Riga, Latvia

The Working Group should

Report to the BSHC Conferences.

  1. To continue the coordination of the implementation of the Baltic Sea Chart Datum 2000 (EVRS with land-uplift epoch 2000), IHO S-100 products S-104 Water Level Information and S-111 Surface Currents in the Baltic Sea.
  2. To prepare the road map for transition and implementation, including e.g.:
    • to establish a network of relevant bodies involved into the transition and efficiently communicate and give guidance within this network
    • to invite relevant organizations, like meteorological and oceanographic institutes, to the working group to strengthen the implementation
    • to invite relevant bodies to inform the users
    • to review of progress of national plans and actions
    • to propose harmonisation actions.
  3. To cooperate with relevant bodies on water level related issues e.g.:
    • to promote studies on the validation, status and distribution of water level information, and to promote studies on interpolation and prediction of water levels
    • to promote studies on displaying schemes for joint Baltic Sea water level information
    • to promote studies on recommendations to IHO bodies how the sea level and its variations should be shown on nautical paper and ENC charts and publications, and conveying water level information to mariners [ref. IHO Technical Resolutions].
  4. To support development of a common harmonized height reference, including maintenance and further development of a common geoid model for the whole Baltic Sea area:
    • to promote geoid computations and gravity measurements in the Baltic sea, as is needed to realize the Baltic Sea Chart Datum 2000
    • to establish a continuity management (future updates) of the BSCD2000 height reference grid
    • to distribute BSCD2000 data products
    • to support geoid and oceanographic studies relevant to these purposes
    • to support the development of recommendations for transformation between national and global reference frames.
  5. To cooperate with relevant international bodies, for example organizations responsible for delivering water level and currents information (e.g. BOOS, NOOS) and geodetic infrastructure (e.g. EUREF and NKG).
  6. To liaise with relevant IHO bodies and study relevant IHO resolutions and specifications.

Members

Activities

Information about IHO

S-100 Products
S-104 Water Level and S-111 Surface Currents
Baltic Sea e-Nav Testbed Öresund

Animations of S-102 (bathymetry), S-104 (water level adjustment) and S-111 (surface currents):

Related information

Information about Baltic Sea Chart Datum 2000 (BSCD2000)

National information

Implementation status BSCD2000, S-104 and S-111

BOOS information related to CDWCWG actions

Meetings

BSHC-CDWCWG

CDWCWG 6th meeting, 20-21 March 2029, Gdansk, Poland (TBC)

  • Documents/Presentations | Invitation | Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Website

CDWCWG 5th meeting, 21-22 March 2028, Rostock, Germany (TBC)

  • Documents/Presentations | Invitation | Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Website

CDWCWG 4th meeting, 23-24 March 2027, Klaipeda, Lithuania (TBC)

  • Documents/Presentations | Invitation | Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Website

CDWCWG 3rd meeting, 24-25 March 2026, Riga, Latvia

CDWCWG Harmonisation subgroup 2nd meeting, 25 June 2025, VTC

CDWCWG Harmonisation subgroup 1st meeting, 11 June 2025, VTC

CDWCWG 2nd meeting, 25-26 March 2025, Tallinn, Estonia

CDWCWG 1st meeting, 26-27 March 2024, Helsinki, Finland

CDWG 14th meeting, 28-29 March 2023, Göteborg, Sweden

CDWG Start-up meeting, 12 October 2022, VTC

CDWG 13th meeting, 7 September 2021, VTC

CDWG 12th meeting, 3-4 March 2020, Gdynia, Poland

CDWG 11th meeting, 5-6 February 2019, Ålborg, Denmark

CDWG 10th meeting, 7-8 February 2018, Arkö, Sweden

CDWG 9th meeting, 4-5 April 2017, Rostock, Germany

CDWG 8th meeting, 23-24 February 2016, Helsinki, Finland

CDWG 7th meeting, 11-12 February 2015, Tallinn, Estonia

BSHC

BSHC 34th meeting, 17-18 September 2029, Aalborg, Denmark (TBC)

  • Event/Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Report | Presentation

BSHC 33th meeting, 18-19 September 2028, Gdansk, Poland (TBC)

  • Event/Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Report | Presentation

BSHC 32th meeting, 20-22 September 2027, Rostock, Germany (TBC)

  • Event/Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Report | Presentation

BSHC 31th meeting, 21-23 September 2026, Klaipeda, Lithuania

BSHC 30th meeting, 22-24 September 2025, Riga, Latvia

BSHC 29th meeting, 17-19 September 2024, Tallinn, Estonia

BSHC 28th meeting, 19-21 September 2023, Helsinki, Finland

BSHC-SCG 1st meeting, 15 March 2023, VTC

BSHC 27th meeting, 20-22 September 2022, Stockholm, Sweden

BSHC 26th meeting, 21-23 September 2021, VTC

BSHC 25th meeting, 22 September 2020, VTC

BSHC 24th meeting, 10-12 September 2019, Gdansk, Poland

BSHC 23rd meeting, 27-29 August 2018, Ålborg, Denmark

NSHC-TWG

TWG 31th meeting, 6-7 February 2029, Aalborg, Denmark (TBC)

  • Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes/Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWG 30th meeting, 1 February 2028, VTC

  • Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes/Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWG 29th meeting, 2-3 February 2027, Hamburg, Germany

  • Documents/Presentations | Invitation/Logistics | Program | Agenda | Minutes/Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWG 28th meeting, 3 February 2026, VTC

TWG 27th meeting, 4-5 February 2025, Taunton, United Kingdom

TWG 26th meeting, 6-7 February 2024, Göteborg, Sweden

TWG 25th meeting, 7 February 2023, VTC

TWG 24th meeting, 27 September 2022, VTC

TWG 23rd meeting, 5-6 February 2020, Reykjavik, Iceland

IHO-TWCWG

TWCWG 14th meeting, 6-8 November 2029, TBC

  • Event/Presentations | Documents | Invitation/Logistics/Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWCWG 13th meeting, 7-10 November 2028, Australia (TBC)

  • Event/Presentations | Documents | Invitation/Logistics/Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWCWG 12th meeting, 2-4 November 2027, South Africa (TBC)

  • Event/Presentations | Documents | Invitation/Logistics/Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWCWG 11th meeting, 10-13 November 2026, Helsinki, Finland

  • Event/Presentations | Documents | Invitation/Logistics/Program | Agenda | Minutes | Actions | Participants | Photo | Portal | Website
  • CDWCWG Presentation

TWCWG 10th meeting, 4-6 November 2025, VTC

TWCWG 9th meeting, 19-22 November 2024, Monaco

TWCWG 8th meeting, 20-22 February 2024, VTC

TWCWG 7th meeting, 28 February – 2 March 2023, VTC

TWCWG 6th meeting, 5-7 April 2022, VTC

TWCWG 5th meeting, 16-18 March 2021, VTC

TWCWG 4th meeting, 8-11 April 2019, Busan, Korea

IHO-HSSC

HSSC 18th meeting, 18-22 May 2026, Gdynia, Poland

HSSC 17th meeting, 5-7 May 2025, Stavanger, Norway

HSSC 16th meeting, 27-31 May 2024, Tokyo, Japan

HSSC 15th meeting, 5-9 June 2023, Helsinki, Finland

HSSC 14th meeting, 16-19 May 2022, Bali, Indonesia + VTC

HSSC 13th meeting, 3-7 May 2021, VTC

HSSC 12th meeting, 19-22 October 2020, VTC

HSSC 11th meeting, 6-9 May 2019, Cape Town, South Africa

HSSC 10th meeting, 14-17 May 2018, Rostock, Germany

Baltic Sea e-Nav

Baltic Sea e-Nav 6th Partner meeting, 29 September – 1 October 2026, Rostock, Germany

  • Event/Documents/Presentations | Invitation/Program/Logistics | Agenda | Report | Photo | Website

Baltic Sea e-Nav 5th Partner meeting, 14-15 April 2026, Göteborg, Sweden

Baltic Sea e-Nav S-104/S-111 Workshop, 26 March 2026, Riga, Latvia + VTC

Baltic Sea e-Nav Midterm Seminar “Smart Maritime Future in the Baltic Sea Region”, 3 December 2025, Copenhagen, Denmark + VTC

Baltic Sea e-Nav 4th Partner meeting, 12-13 November 2025, Riga, Latvia

World ECDIS day 2025, Project: Baltic Sea e-Nav, 17 September 2025, Hamburg, Germany

Baltic Sea e-Nav Kick-off 4th project period, 16 June 2025, VTC

European Maritime Days, Project: Baltic Sea e-Nav, 21-23 May 2025, Cork, Ireland

Baltic Sea e-Nav 3rd Partner meeting (Pilot sessions), 9-11 April 2025, Rauma, Finland

Baltic Sea e-Nav 2nd Partner meeting, 3-4 December 2024, Tallinn, Estonia

Baltic Sea e-Nav 1st Partner meeting, 17-18 April 2024, Helsinki, Finland

Baltic Sea e-Nav Kick-off meeting, 6-7 November 2023, Stockholm, Sweden

NKG/Kartdagarna

Kartdagarna, 10-12 March 2026, Uppsala, Sweden

NKG Summer School “From Struve to the Space”, 25-29 August 2025, Tartu, Estonia

Kartdagarna, 8-10 April 2025, Skellefteå, Sweden

Kartdagarna, 16-18 April 2024, Göteborg, Sweden

EUREF Symposium, 23-26 May 2023, Göteborg, Sweden

NKG General Assembly meeting, 5-8 September 2022, Copenhagen, Denmark

Kartdagarna, 20-21 April 2021, VTC

NKG meeting, 10-11 March 2020, Reykjavik, Iceland

NKG meeting, 11-13 March 2019, Lyngby, Denmark

Kartdagarna, 20-22 mars 2018, Linköping, Sweden

BOOS

BOOS Annual meeting / Scientific workshop, 14-16 September 2026, Riga, Latvia + VTC

  • Documents/Presentations | Invitation/Logistics/Program | Agenda | Minutes/Participants | Actions | Photo | Website

BOOS Annual meeting / Scientific workshop, 2-4 June 2025, Sopot, Poland + VTC

BOOS Annual meeting / Scientific workshop, 6-8 May 2024, Copenhagen, Denmark

BOOS Annual meeting / Scientific workshop, 9-11 May 2023, Helsinki, Finland

BOOS Annual meeting, 14 December 2022, VTC

BOOS Annual meeting / Scientific Workshop, 24-26 November 2021, VTC

BOOS Annual meeting, 4-6 November 2020, VTC

BOOS Annual meeting, 12-13 June 2019, Rostock, Germany

BOOS Annual meeting, 22-23 May 2018, Brussels, Belgium

BOOS Annual meeting, 22-24 May 2017, Copenhagen, Denmark

BOOS Annual meeting, 16-17 May 2016, Sopot, Poland

IOC-GLOSS

GLOSS GEXVIII meeting, 11-14 March 2025, Panama City, Panama + VTC

GLOSS GEXVII meeting, 7-10 November 2022, Paris, France

GLOSS GEXVI meeting, 11-13 April 2019, Busan, Korea