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“To provide technical advice and promote co-ordination on tidal issues especially within the North Sea Hydrographic Commission (NSHC)”

Photo: Tidal Working Group 27th meeting, 4-5 February 2025, Taunton, United Kingdom
The Working Group should
Report to the NSHC Conferences.
- Work according to the agreed NSHC work plan.
- Monitor and report the progress of the work plan.
- Propose new work plan items for consideration by the NSHC.
- Liaise with relevant Hydrographic Services and Standards Committee (HSSC) working groups, such as TWCWG.
- Exchange views and experiences concerning tidal issues like unifying vertical datums, analysis, modelling and related issues like sea level rise and surge.
- Coordinate the implementation of S-104 Water Levels and S-111 Surface Currents and report on the progress to NSICCWG.
- Terms of Reference
- WorkPlan and List of Actions
- Implementation status of S-104 and S-111
- NSHC Statues 2024
Members
Activities
Information about IHO
- IHO Miscellaneous Publications
- IHO Portal
- IHO Publications
- IHO Resolutions
- IHO Standards and Specifications
- IHO Strategic Plan
- IHO Website
S-100 Products
- S-100 Implementation Strategy
- S-100 Introduction
- S-100 Product Specifications
- S-100 Product Specification IHO Geospatial Information Registry
- S-100 Resources
- S-100 RoadMap (Annex 2)
- S-100 Testbed IHO Geospatial Information Registry
- S-100 Universal Hydrographic Data Model
- S-100 Video presentation
- S-100 Working Group
S-104 Water Level and S-111 Surface Currents
- Hydrographic Services and Standards Committee (HSSC)
- Tides, Water Level and Currents Working Group (TWCWG)
- TWCWG report to HSSC17
- TWCWG (presentation GLOSS GEXVIII)
- S-98 Data Product Interoperability in S-100 Navigation Systems
- S-158:98 Cross Product Validation
- S-104 Water Level Product Specification
- S-104 Water Level Product Specification (presentation TWCWG8)
- S-104 Water Level Information on S-100 ECDIS (report)
- S-104 Water Level Information on S-100 ECDIS (presentation)
- S-111 Surface Currents Product Specification
- S-111 Water Level Product Specification (presentation TWCWG8)
- S-111 Surface Currents Test data page
- S-111 Surface Currents Simulation Test – Sweden Trollhättan Locks
Related information
- IMO Maritime Service 15 – Real Time Hydrographic and Environmental Information Service
- Baltic Sea – Real Time Hydrographic and Environmental Information Service
- Baltic Sea e-Nav Interreg Baltic Region project
- BSHC Chart Datum, Water level and Currents Working Group (CDWCWG)
- National example on S-100 Work: Australian S-100 Working Group
- SMA MetOc – Meteorological and Oceanographic Information

Meetings
TWG 28th meeting, 3-4 February 2026, VTC
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
TWCWG 10th meeting, 4-7 November 2025, TBC
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
HSSC 17th meeting, 5-7 May 2025, Stavanger, Norway
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 38th meeting, 8-9 April 2025, VTC
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWG Report / Presentation
GLOSS GEXVIII meeting, 11-14 March 2025, Panama+VTC
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Participants / Photo / Website
- TWCWG Presentation
- Sweden and CDWCWG Presentation
TWG 27th meeting, 4-5 February 2025, Taunton, United Kingdom
TWCWG 9th meeting, 19-22 November 2024, Monaco
HSSC 16th meeting, 27-31 May 2024, Tokyo, Japan
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 37th meeting, 8-10 April 2024, Malmö, Sweden
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWG Report / Presentation
TWCWG 8th meeting, 20-22 February 2024, VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- S-104 Water Level Product Specification (presentation)
- S-111 Surface Currents Product Specification (presentation)
TWG 26th meeting, 6-7 February 2024, Göteborg, Sweden
HSSC 15th meeting, 5-9 June 2023, Helsinki, Finland
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 36th meeting, 29-30 March 2023, VTC
- Documents / Presentations / Minutes / Actions / Photo / Website
- TWG Report / Presentation
TWCWG 7th meeting, 28 February – 2 March 2023, VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
TWG 25th meeting, 7 February 2023, VTC
GLOSS GEXVII meeting, 7-10 November 2022, Paris, France
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Presentation
TWG 24th meeting, 27 September 2022, VTC
HSSC 14th meeting, 16-19 May 2022, Bali+VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 35th meeting, 5-6 April 2022, Reykjavik, Iceland
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWG Report / Presentation
TWCWG 6th meeting, 5-7 April 2022, VTC
HSSC 13th meeting, 3-7 May 2021, VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 34th meeting, 27-28 April 2021, VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWG Report / Presentation
TWCWG 5th meeting, 16-18 March 2021, VTC
- Documents / Presentations / Minutes / Actions / Participants / Website
HSSC 12th meeting, 19-22 October 2020, VTC
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation / Presentation (short version)
TWG 23rd meeting, 5-6 February 2020, Reykjavik, Iceland
HSSC 11th meeting, 6-9 May 2019, Cape Town, South Africa
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
GLOSS GEXVI meeting, 11-13 April 2019, Busan, Korea
- Invitation / Logistics / Program / Agenda
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Presentation
TWCWG 4th meeting, 8-11 April 2019, Busan, Korea
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
HSSC 10th meeting, 14-17 May 2018, Rostock, Germany
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWCWG Report / Presentation
NSHC 33rd meeting, 27-28 March 2018, Ostend, Belgium
- Documents / Presentations / Minutes / Actions / Participants / Photo / Website
- TWG Report / Presentation