---
title: "Charts and Data"
description: "Open and volunteer charting projects."
---

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Open source, crowd-sourced and volunteer charts and other data sources.

- [Admiralty Datahub](https://datahub.admiralty.co.uk) - API portal for the UK Hydrographic Office.
- [Antares Charts](https://www.antarescharts.co.uk) - Volunteer project for charting and pilotage of West Coast Scotland.
- [Citizen Sea](https://www.hubocean.earth/citizen-sea) - Citizen science marine biology app, iOS and Android.
- [C-Map](https://www.c-map.com/) - Global coastal, ocean, inland mapping and bathymetry. Mobile plotter, weather, route plotting mobile app for iOS and Android with free and premium options.
- [ENC Coverage Catalogue](https://iho.maps.arcgis.com) - Global catalogue of ENC (Electronic Navigation Chart) references.
- [Mapterhorn](https://mapterhorn.com) - Open Source terrain tiles for interactive web map visualizations.
- <img src="../images/icons/github.ico" alt="" width="16" height="16"> [Nautical Chart Catalogs](https://chartcatalogs.github.io) - Machine readable index of free to use nautical charts.
- [OpenBathy](https://www.openbathy.org) - Open access bathymetry data.
- [Open Earth](https://www.openearth.nl) - Dutch open marine data, including detailed Wadden Sea mapping.
- [OpenSeaMap](https://www.openseamap.org/index.php?id=openseamap&L=1) - Open sourced charts, in English, German, Spanish, French, Italian, Russian and Arabic.
- [OpenTide](https://opentide.io) - Crowd sourced tidal data, with SignalK plugin.
- [OpenWaters](https://openwaters.io) - Open source nautical web map tiles: [Seamap](https://openwaters.io/charts/seamap), a chart style rendered weekly from OpenStreetMap seamarks, [AISCast](https://openwaters.io/ais/), [Sky Almanac](https://openwaters.io/sky/), [CrowdDepth](https://openwaters.io/bathymetry/crowd-depth/) and [Seascape](https://openwaters.io/charts/seascape), global bathymetry merged from GEBCO and regional open sources. Plus tide predictions.
- [S-100](https://iho.int/en/s-100-universal-hydrographic-data-model) - Universal hydrographic data model, from the IHO (International Hydrographic Organization).