UK and Channel Islands tide gauges: Generated using E.U. Copernicus Marine Service Information; Global Ocean - Delayed Mode Sea level product (INSITU_GLO_PHY_SSH_DISCRETE_MY_013_053), https://doi.org/10.17882/93670. Harmonic constants analysed by the course.
French tide gauges: sea-level observations from REFMAR, Shom (Réseaux de référence des observations marégraphiques), downloaded September 2026, Licence Ouverte 2.0 (Etalab). Harmonic constants analysed by the course; this reuse is not endorsed by the Shom.
Secondary ports: "The FES2022 Tide product was funded by CNES, produced by LEGOS, NOVELTIS and CLS and made freely available by AVISO". CNES, 2024. FES2022 (Finite Element Solution) Tidal model (Version 2024) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2024.004 — AVISO License Agreement (Issue 20), https://www.aviso.altimetry.fr/fileadmin/documents/data/License_Aviso.pdf. Modified from the original distribution: harmonic constants extracted at port positions and referred to chart datum.
Tidal streams: Shom, 2026. Atlas de courants de marée 2D au format netcdf, https://dx.doi.org/10.17183/ATLASCOURANTS2D_NETCDF. Licence Ouverte (version 2.0 d'avril 2017), définie par la mission Etalab.
Tidal streams where the Shom grid does not reach: Generated using E.U. Copernicus Marine Service Information; https://doi.org/10.48670/moi-00054
Traffic separation schemes (France): Shom, 2021. Traffic separation schemes (Dispositifs de séparation du trafic), Licence Ouverte 2.0. Ne pas utiliser pour la navigation.
Wrecks and obstructions: Contains public sector information, licensed under the Open Government Licence v3.0, from the UK Hydrographic Office.
Lights and buoys: Shom, 2026. https://dx.doi.org/10.17183/DOI_BALISAGE_MARITIME
Lights: List of Lights, Radio Aids and Fog Signals, Pub. 114 — National Geospatial-Intelligence Agency (NGA).
Nature of the seabed: Seabed substrates, EMODnet Geology, CC-BY 4.0, https://creativecommons.org/licenses/by/4.0/
Place names: GeoNames, CC-BY 4.0, https://www.geonames.org
Magnetic variation: World Magnetic Model 2025 (NOAA/NCEI and BGS).
None of this material is to be used for navigation.