OpenOcean — data sources, attributions and licences

Effective date: 20 October 2026

OpenOcean is built on data from public agencies, open projects and licensed providers. This page credits them and states the licence each one is used under. None of these sources, and nothing derived from them in OpenOcean, is for navigation — see our Terms, section 1. Where a source requires a specific form of words, it appears here verbatim.

Base map

• Mapbox — base map styles and map search. © Mapbox. Mapbox Terms of Service: mapbox.com/legal/tos · Privacy Policy: mapbox.com/legal/privacy.
• OpenStreetMap — map data, and marine points of interest. © OpenStreetMap contributors, Open Database License (ODbL): openstreetmap.org/copyright.

Points of interest

• OpenStreetMap contributors (ODbL), as above.
• Overture Maps Foundation — points of interest. Overture Maps Foundation data, CDLA-Permissive-2.0: overturemaps.org.
• Foursquare OS Places — points of interest. © Foursquare Labs, Inc., Apache-2.0: opensource.foursquare.com/os-places.
• Google Places — nearby-place search results are provided by Google and subject to Google's terms.
• Natural Earth — coastline and land mask used to classify positions on the device. Public domain: naturalearthdata.com.

Anchorages and marinas

• Licensed anchorage and marina data providers, used under commercial licence.
• OpenStreetMap contributors (ODbL), as above.
• OpenOcean users — corrections, reviews, photos and confirmations, contributed under our Terms (section 7).

Anchorage depths, holding, shelter, prices, contacts and reviews are unverified information, whatever their source.

Weather and ocean

• ECMWF — wind and forecast fields (IFS, and AIFS: its AI model). This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF), modified by OpenOcean. Source: www.ecmwf.int. Licence: CC BY 4.0 (creativecommons.org/licenses/by/4.0/). ECMWF does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use.
• Deutscher Wetterdienst (DWD) — ICON model. ICON forecast data based on data from Deutscher Wetterdienst (DWD), modified by OpenOcean.
• Météo-France — AROME model, for France and the French overseas regions (the Antilles, French Guiana, Réunion and the Indian Ocean, New Caledonia, French Polynesia). AROME forecast data from Météo-France, used under the Licence Ouverte / Open Licence 2.0 (Etalab) and modified by OpenOcean; the age of each forecast is shown with it.
• NOAA / NWS — forecast models — GFS (global) with its GFS-Wave wave model, HRRR (United States), AIGFS and the National Blend of Models (NBM: the United States, and its Oceanic domain across the Pacific and the Atlantic). Public domain (U.S. Government).
• Wind and gust forecasts may combine some of the models above: ECMWF IFS, GFS, ICON, AROME and HRRR. The others, NBM among them, are never combined.
• NOAA CO-OPS — tide predictions at United States stations. Public domain (U.S. Government).
• AVISO+ / CNES — FES2022 — tide predictions outside station coverage. Generated using AVISO+ Products (FES2022 ocean tide model, CNES/AVISO), modified by OpenOcean.
• Copernicus Marine Service (Mercator Ocean International) — ocean currents and tidal currents: Global Ocean Physics Analysis and Forecast, doi.org/10.48670/moi-00016; wind waves and swell: Global Ocean Waves Analysis and Forecast (MFWAM), doi.org/10.48670/moi-00017. Generated using E.U. Copernicus Marine Service Information, modified by OpenOcean.
• NOAA / NWS — MRMS weather radar (Americas), GOES Geostationary Lightning Mapper flashes, GOES satellite imagery, tropical-cyclone advisories (National Hurricane Center), IBTrACS historical cyclone tracks, marine-weather bulletins, and buoy and station observations (NDBC, Aviation Weather Center). Public domain (U.S. Government); NOAA does not endorse OpenOcean.
• EUMETNET OPERA — composite weather radar for most of Europe, from EUMETNET's Open Radar Data service via MeteoGate. European radar composite © EUMETNET OPERA members, via MeteoGate (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/), modified by OpenOcean.
• EUMETSAT — Meteosat satellite imagery (Meteosat-12 FCI over Europe and Africa, Meteosat-9 SEVIRI over the Indian Ocean) in the Clouds layer's live satellite loop, always at least one hour old, used under the EUMETSAT Data Policy. Contains modified EUMETSAT Meteosat data 2026.
• Japan Meteorological Agency (JMA) — Himawari-9 satellite imagery in the Clouds layer's live satellite loop, distributed by NOAA through its Open Data Dissemination program. Himawari-9 (AHI) imagery © Japan Meteorological Agency, distributed by NOAA, modified by OpenOcean. Neither JMA nor NOAA endorses OpenOcean.
• Joint Typhoon Warning Center (U.S. Navy / U.S. Air Force) — tropical-cyclone advisories for the Pacific and Indian Oceans. Public domain (U.S. Government).
• WMO Worldwide Met-Ocean Information and Warning Service (WWMIWS), NOAA/NWS (the METAREA IV and XII bulletins, fetched directly) and the issuing national services — GMDSS METAREA bulletins, as issued.
• Observed rain and lightning — Rain & Lightning's past two hours are ground radar where it reaches and a satellite rain-rate blend everywhere else, with lightning flashes at the present time. The app credits every source in the feed with the line in italics, verbatim:
  • NOAA / NESDIS — Enterprise Rain Rate global blend — satellite rain rate, 70°N–60°S. Satellite rain rate: NOAA/NESDIS Enterprise Rain Rate global blend (from GOES, Himawari and Meteosat imagery), via NOAA Open Data Dissemination, modified by OpenOcean. Public domain (U.S. Government; NOAA's NCEI lists the product as CC0). NOAA requests attribution and does not endorse OpenOcean.
  • NOAA / NWS — MRMS — radar for the United States (including Alaska and Hawaii), Puerto Rico and the northeast Caribbean, and Guam. US radar: NOAA MRMS. Public domain (U.S. Government).
  • EUMETNET OPERA — radar composite for most of Europe, via MeteoGate. European radar composite © EUMETNET OPERA members, via MeteoGate (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/), modified by OpenOcean. Licence: CC BY 4.0, as stated in the metadata of every file.
  • Central Weather Administration (Taiwan) — radar for Taiwan and the Taiwan Strait, dataset O-A0059-001 (QPESUMS radar integrated echo grid). Taiwan radar: Central Weather Administration, QPESUMS radar integrated echo grid (O-A0059-001), modified by OpenOcean. This open data is released to the public under the Open Government Data License, version 1.0 (https://data.gov.tw/license); users may use it provided they comply with its provisions. Licence: Open Government Data License, version 1.0 — data.gov.tw/license (English: data.gov.tw/en/license). The attribution is a condition of the licence.
  • National Environment Agency (Singapore) — radar within 240 km of Singapore (the Singapore Strait, the southern Malacca Strait, Riau), from the Weather Radar Images dataset on data.gov.sg. Singapore radar: contains information from Weather Radar Images (National Environment Agency) accessed in real time from data.gov.sg, which is made available under the terms of the Singapore Open Data Licence version 1.0 (https://data.gov.sg/open-data-licence), modified by OpenOcean. Licence: Singapore Open Data Licence, version 1.0 — data.gov.sg/open-data-licence. Its use here claims no official status, and no endorsement of OpenOcean by NEA or any other Singapore Government agency.
  • EUMETSAT — MTG-I1 Lightning Imager — lightning flashes over Europe, Africa and the eastern Atlantic. European lightning © EUMETSAT (MTG-I1 LI, CC BY 4.0), modified by OpenOcean. Licence: CC BY 4.0 (creativecommons.org/licenses/by/4.0/).
  • GOES Geostationary Lightning Mapper flashes are credited Lightning: NOAA GOES GLM. (NOAA, above).

Forecast fields are re-processed into map tiles by OpenOcean; the age of every field is shown in the app. Model output is not a measurement.

Vessel traffic (AIS)

• AIS positions come from shore-based receiver networks, merged and relayed through OpenOcean's servers: the aisstream.io community network, and Open Waters aiscast (ais.openwaters.io), which re-serves open government feeds and volunteer receivers under each source's own terms. Coverage is terrestrial only (no satellite), incomplete, and can be delayed. Not for collision avoidance.
• Contains data under the Norwegian licence for Open Government data (NLOD) distributed by the Norwegian Coastal Administration. Data delivered by BarentsWatch.
• Source: Fintraffic / digitraffic.fi, license CC 4.0 BY.
• AIS data from AISHub and volunteer receivers (CC0), via Open Waters.
• The MMSI of a private leisure craft can identify its owner. If that is your boat and you do not want it shown, see the Privacy Policy for how to have it removed.

Icons, fonts and software

• Font Awesome Free — map marker icons. CC BY 4.0, © Fonticons, Inc.: fontawesome.com.
• Phosphor Icons — boat marker glyph. MIT, © Phosphor Icons: phosphoricons.com.
• Lucide — interface icons. ISC licence: lucide.dev.
• Fonts — Cormorant, DM Sans, Figtree, IBM Plex Mono and Instrument Serif, each under the SIL Open Font License 1.1.
• Open-source software — OpenOcean is built with React Native, Expo and other open-source libraries, used under their respective licences.

Trademarks

Apple and the App Store are trademarks of Apple Inc. Google Play is a trademark of Google LLC. Other names are the property of their owners; their use here is for identification only and implies no endorsement of OpenOcean.