TidePlanet

Where our data comes from

Everything you see on TidePlanet comes from open data or our own calculations. Here is each source, its license and which parts are already live.

2 sources

Tides

The tide stations and the global model we use to calculate the tide at each place.

  • Tide stations

    Slackwater database
    Live

    The constants of thousands of tide stations around the world: the numbers our engine uses to calculate the tide at each place (times, heights and coefficient).

    License
    MIT code; each station has its own license.
    Credit
    On each place we show its station's credit exactly as its license asks.
    • NOAA (U.S.): Public domain.
    • TICON-4: CC BY 4.0. Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE. (DOI)
    • LINZ (New Zealand): CC BY 4.0. This work is based on Toitū Te Whenua Land Information New Zealand data which are licensed by Toitū Te Whenua Land Information New Zealand for re-use under the Creative Commons Attribution 4.0 International licence: the constants of its 56 ports and, for about 220 secondary ports, the time and height differences of its 2026–27 table, which we apply to the tide at their standard port. (DOI)
    • Kartverket (Norway): ©Kartverket, CC BY 4.0. The constants of its 33 permanent stations and its tidal zones: in each zone, the tide at its station with the time delay and height factor Kartverket gives (we compute it ourselves, as its API describes). (DOI)
    • Marine Institute (Ireland): CC BY 4.0. Its tide predictions at 38 points (gauges of the national network and points of its ocean model). For the 20 that do not already have a TICON-4 station, we fit the constants ourselves from a year of its predictions: within 1 to 5 minutes and 1 to 4 cm of its tables.
    • JMA (Japan): Public Data License 1.0 (compatible with CC BY 4.0). 出典：気象庁ホームページ. The tide tables (潮位表) of the Japan Meteorological Agency at 239 points. For the 68 that do not already have a TICON-4 series that matches them, we fit the constants ourselves from two years of its hourly predictions (気象庁「潮位表」を加工して作成): about 2 minutes and 1 cm from its 2027 tables. Not an official JMA publication. (website)
    • KHOA (Korea): No restrictions on use (Korea’s open data portal, data.go.kr). The M2, S2, K1 and O1 constants of 87 reference ports of the Korea Hydrographic and Oceanographic Agency (two of them in North Korea). We infer the other constituents from those four, so the tide can differ from its tables by about 10 minutes and 10 cm. (website)
    • Environment Agency (UK): Open Government Licence v3.0. This uses Environment Agency tide gauge data from the real-time data API (Beta). Sea level measured every 15 minutes at the 44 gauges of the national network. At 38 of them we fit the constants ourselves from a year of readings: 3 that TICON-4 lacks (Barmouth, Bangor and Sheerness) and 35 we use instead of the TICON-4 ones for the same gauge (the two fits differ by about 5 minutes and 3 inches, 7 cm); at the rest (Stornoway, Mumbles, Avonmouth and Jersey) there is no usable year of readings. (website)
    • Maritime Safety Queensland (Australia): CC BY 4.0, © State of Queensland (Department of Transport and Main Roads). Sea level measured every 10 minutes at its tide gauges. For the 12 that TICON-4 does not have, or where its series departs from the official prediction, we fit the constants ourselves from a year of readings: about 6 minutes and 6 cm from that prediction. (website)
    • CWA (Taiwan): Data Providing Organization: Central Weather Administration (CWA), Ministry of Transportation and Communications of Taiwan (“提供機關／交通部中央氣象署”), datasets “潮汐預報－明年逐時潮高預報” (F-C0036-001) and “潮汐預報－未來1個月潮汐預報” (F-A0021-001). The Open Data is made available to the public under the Open Government Data License, version 1.0, User can make use of it when complying to the condition and obligation of its terms. CWA does not publish harmonic constants: we fit them ourselves from the hourly heights for 2027 at its 42 tide stations in Taiwan, Penghu, Kinmen and Matsu (1 minute and under 1 cm from its high and low tides), and we derive 161 of its points (towns, harbors, beaches, fishing, diving and surf spots) from their tide station with the time difference and height ratio CWA gives. The month CWA publishes now runs about 4 inches (10 cm) lower than its 2027 prediction and than the sea level measured at its tide stations: we follow the 2027 one. (license)
    • Environment Agency, local stations (England): Open Government Licence v3.0. This uses Environment Agency flood and river level data from the real-time data API (Beta). Water level measured every 15 minutes at its tidal level stations in estuaries and harbors (the Thames, the Humber, The Wash, the Solent, Berwick, Dartmouth…). For the 36 that do not already have a station at the same site and do not dry out at low tide, we fit the constants ourselves from a year of readings: about 13 minutes and 6 inches (16 cm) from the readings of the last few weeks, left out of the fit (weather and river flow included; the station those sites had before, about 27 minutes and 9 inches). (website)
    • Rijkswaterstaat (Netherlands): CC0 (public domain). Water level measured every 10 minutes at 4 tide gauges on the Scheldt: Antwerp, Kallo, Fort Liefkenshoek and Hansweert. We fit the constants ourselves from a year of readings: about 6 minutes and 4 inches (11 cm) from its official astronomical tide at Hansweert. (website)
    • REFMAR (France): Licence Ouverte 2.0. REFMAR, Réseaux de référence des observations marégraphiques (doi:10.17183/REFMAR): tide gauges of the Shom and its partners (Vigicrues, HAROPA PORT, Cap Atlantique, Golfe du Morbihan – Vannes Agglomération, the Brittany Region…). For the 29 that TICON-4 does not have (the Seine estuary, Brittany, Le Croisic, the Adour, Saint Pierre and Miquelon, Mayotte, French Guiana and the Marquesas) we fit the constants ourselves from a year of readings: about 11 minutes and 5 inches (12 cm) from the readings of the last few weeks, left out of the fit. (website)
    • Department of Transport (Western Australia): CC BY 4.0. The sea level records of its tide gauges (“Tide Stations”, DOT-025). At 15 of them we fit the constants ourselves from one to three years of readings: the 8 that had no station at the same site (Dampier, Cape Lambert, Tantabiddi, Coral Bay, Denham, Rat Island, Augusta and Emu Point) and 7 we use instead of the TICON-4 series for the same gauge (Albany, Bunbury, Busselton, Exmouth, Fremantle, Jurien Bay and Onslow). (website)
    • Other sources: Other hydrographic services, under the license shown for each station.

    We leave out any station whose license does not allow commercial use.

  • Global tide model

    FES2022 (LEGOS, NOVELTIS and CLS, for CNES; distributed by AVISO)
    Live

    A model of the tide across all the oceans that combines the physics of the sea with almost 30 years of satellite measurements, on a fine grid near the coast (1/30 of a degree, about 2 miles). We use it at places with no tide station within 50 km (level M): we take its nearest cells offshore, and only where we have checked it against the surrounding tide stations. We do not use it in estuaries, rivers or the bays and coasts where it fails. Where we show it, against about 830 stations, high and low tide times are off by about 7 minutes and heights by about 7 cm (half the time, less); 9 times out of 10, by less than 25 minutes and 16 cm. Heights are above mean sea level.

    Credit
    FES2022 Tide was produced by LEGOS, NOVELTIS and CLS, funded by CNES, and distributed by AVISO (doi:10.24400/527896/a01-2024.004). Modified data: TidePlanet computes the constants of each place from the model cells.
    • EOT20: And, where FES2022 does not fit but EOT20 does (checked the same way, against the surrounding stations), the EOT20 model (DGFI-TUM; CC BY 4.0): Hart-Davis, M., Piccioni, G., Dettmering, D., Schwatke, C., Passaro, M., Seitz, F. (2021). EOT20 - A global Empirical Ocean Tide model from multi-mission satellite altimetry. SEANOE, doi:10.17882/79489. Data modified in the same way. It was our model until 27/10/2026: against the same stations, FES2022 can be shown on 20% more coast and fits a little better (at 79% of stations, against 76%).
Tides

How we calculate the tide

Tides can be predicted because they depend mostly on where the sun and the moon are. Years of measurements at a tide station give its “constants”: a set of numbers that let us calculate the tide at that spot for any day.

Every place on TidePlanet has an accuracy level, shown next to its name, that tells you where its tide comes from:

  • A · Official station

    There is a tide station a few miles away (up to about 5 miles, 8 km), usually in the same bay or estuary. The tide comes from its constants. This is the most reliable level.

  • B · Nearby station

    The nearest station on the same water is less than 30 miles (50 km) away (one across an isthmus or a peninsula, with a different tide, does not count). The tide is that station’s: on the open coast it is within a few minutes, but inside estuaries and inlets it can be further off.

  • M · Global model

    There is no station within 30 miles (50 km), but the global FES2022 tide model (or, where that one does not fit, EOT20) works on that coast: we have checked it against the surrounding tide stations. The tide comes from the model, using its nearest cells offshore. It may differ from the real tide by a few minutes and inches, and heights are above mean sea level, not chart datum. Not for navigation.

  • C · No station nearby

    There is no station on the same water within 30 miles (50 km) and the global model is not reliable there (estuaries, rivers, enclosed bays or coasts where it fails): for now we don’t show its tide.

  • No noticeable tide

    In some seas the tide is almost zero, such as much of the Mediterranean. There we say so and show everything else: the sun, the moon and the weather.

We calculate the tide ourselves, with the open-source @slackwater/engine (MIT) and the harmonic constants of each station: NOAA’s in the U.S. (public domain) and TICON-4’s (CC BY 4.0), from the Slackwater database; those of the official services of Japan (JMA and Japan Coast Guard), Denmark (DMI), South Korea (KHOA), the United Kingdom (Environment Agency), Ireland (Marine Institute), New Zealand (LINZ), Norway (Kartverket), Taiwan (CWA) and Queensland, Australia; and, where there is no station within 30 miles (50 km), the global FES2022 and EOT20 models, only on coasts where we have checked them. For NOAA subordinate stations we apply NOAA’s official time and height corrections to the reference station.

Compared with NOAA’s official predictions at 29 reference and subordinate stations (Atlantic, Gulf of Mexico, Pacific, Alaska and Hawaii) over October 2026, high and low tide times differ by 3 minutes on average and heights by 0.6 inches (1.6 cm).

The tide coefficient follows the French and Spanish scale (20 to 120): 70 × today’s tidal amplitude / the place’s mean amplitude. 45 is an average neap tide, 70 an average tide, 95 an average spring tide and 100 or more a big spring tide. At Brest it stays within 2 points, on average, of the official SHOM coefficient. On coasts with diurnal tides, like the Gulf of Mexico, it is based on the diurnal tide.

Heights are above each station’s chart datum: MLLW in the U.S., LLWLT in Canada and the lowest astronomical tide (LAT, or a datum very close to it) in Europe and most other places. Where the tide comes from the global model (level M), they are above mean sea level. This is an astronomical prediction: it does not include the effect of wind or air pressure, and it is not for navigation.

TidePlanet tides are for fishing and leisure. They are not for navigation: for that, always use the official tide tables and charts of your hydrographic service.

3 sources

Weather and climate

The hour-by-hour forecast, sea conditions and what is normal for each month of the year.

  • Weather and sea state

    Open-Meteo
    Live

    Sky, temperature, wind, pressure, rain, waves, water temperature, air quality and pollen. It runs on our own server with Open-Meteo open data. For each spot and lead time we use the best model that covers it: HRRR and NBM in the U.S., AROME in France and northern and central Spain, ICON-EU in Europe, then ECMWF and GFS. We also compare up to seven models to show how much to trust the forecast, and give the outlook for the coming weeks and months.

    License
    CC BY 4.0
    Credit
    Weather data by Open-Meteo.com, licensed under CC BY 4.0. The models come from the services credited below.
    • ECMWF (European Centre for Medium-Range Weather Forecasts): IFS, AIFS, its 51-member ensemble, the WAM wave model, the 46-day forecast and the SEAS5 seasonal forecast. © ECMWF (www.ecmwf.int), open data under CC BY 4.0. We combine it with other models; ECMWF does not accept any liability for errors or omissions in the data or for their use.
    • NOAA (U.S.): GFS, GEFS, HRRR, NBM and the GFS-Wave model from the National Weather Service. Public domain.
    • Météo-France: AROME, ARPEGE and the MFWAM wave model. Open data (Etalab Open Licence 2.0), crediting Météo-France and the time of each forecast.
    • DWD (German weather service): ICON and ICON-EU. The ICON thunderstorm codes drive the “Thunderstorm risk: get out of the water” notice for the next 12 hours on the Weather, Beach and Fishing pages (in the U.S., together with the NOAA NBM thunderstorm probability). Open data from Deutscher Wetterdienst under CC BY 4.0 (“Quelle: Deutscher Wetterdienst”).
    • Copernicus: Water temperature, currents and sea level (Copernicus Marine, with the Météo-France ocean model) and air quality, UV and pollen (CAMS). From the sea level we work out the storm surge for the next 48 hours on the Tides and Beach pages: how far the sea may rise above the astronomical tide where our tide comes from a nearby station, and above its normal level in the almost tideless Baltic, Mediterranean and Sea of Marmara (in the Baltic, corrected with the air pressure from the ECMWF model). The Tides page also warns of strong drops, which matter for anchoring and entering harbor. It is not an official warning. Copernicus Marine: free to use, including commercially, with credit (“Generated using E.U. Copernicus Marine Service Information”). CAMS: CC BY 4.0 (“Contains modified Copernicus Atmosphere Monitoring Service information”).

  • Climate by month

    NOAA, TerraClimate, NASA POWER and Copernicus; cyclones: IBTrACS (NOAA NCEI)
    Live

    The normal for each month of the year (1991–2020 averages): water temperature, highs and lows, rainfall and rainy days, sunshine hours, wind and waves. With them we tell you whether today's water or air is above or below normal and the best time to visit and to swim. We compute it once a year for the grid cell of every place with a page. Where tropical cyclones pass, we also say in which months and how many passed nearby in the last 30 years.

    License
    public domain, CC0 and CC BY 4.0 (depending on the source; see below).
    Credit
    NOAA OISST v2.1; TerraClimate (University of Idaho); NASA POWER (NASA Langley Research Center); Copernicus ERA5 (C3S/ECMWF), via Open-Meteo; NOAA's International Best Track Archive for Climate Stewardship (IBTrACS) data.
    • NOAA OISST v2.1: Water temperature: monthly averages for 1991–2020 from satellites, ships and buoys (0.25°). Public domain.
    • TerraClimate: Highs, lows, rainfall, wind and solar radiation: 1991–2020 normals at about 4 km. Abatzoglou et al. (2018), Scientific Data 5:170191. Public domain (CC0). (DOI)
    • NASA POWER: Rainy days, counted from daily MERRA-2 data for 1991–2020, and sunshine where TerraClimate does not reach (CERES). CC BY 4.0, no restrictions on use. Data from the NASA Langley Research Center POWER Project, funded through the NASA Earth Science Directorate Applied Science Program.
    • ERA5 (Copernicus): Average wave height for each month (2011–2020), from the Open-Meteo open data bucket. Contains modified Copernicus Climate Change Service information; CC BY 4.0.
    • IBTrACS (NOAA NCEI): Tropical cyclones: how many passed within 150 km (93 miles) of each place in the last 30 full years (1996 to 2025), month by month, counting those of tropical-storm strength or more (winds of 39 mph or more) and how many had hurricane-force winds. NOAA's International Best Track Archive for Climate Stewardship (IBTrACS) data, accessed on October 25, 2026. Gahtan, J., K. R. Knapp, C. J. Schreck, H. J. Diamond, J. P. Kossin, M. C. Kruk, 2024: International Best Track Archive for Climate Stewardship (IBTrACS) Project, Version 4r01 (since1980). NOAA National Centers for Environmental Information. doi:10.25921/82ty-9e16. Knapp, K. R., M. C. Kruk, D. H. Levinson, H. J. Diamond, and C. J. Neumann, 2010: Bulletin of the American Meteorological Society, 91, 363-376. doi:10.1175/2009BAMS2755.1. Public domain. (DOI)

    Sunshine hours are estimated from solar radiation (FAO Ångström-Prescott formula). Normals are not a forecast: any given year can turn out very different.

  • Airport reports (METAR)

    National Weather Service's Aviation Weather Center (NOAA), aviationweather.gov
    Live

    What the weather station at the nearest coastal airport (20 km or less from the place) is measuring now: mean wind, gusts and direction, visibility, fog, thunderstorms, rain and temperature. Airports report every 30 or 60 minutes; we show it on the Wind and Weather pages with its time and distance, and flag thunderstorms or fog. We fetch the file with every report in the world every 10 minutes at most, never once per visit.

    Credit
    METAR reports from the Aviation Weather Center (NOAA/NWS), https://aviationweather.gov.

    It's a measurement at the airport, not on the beach: on the coast, wind and fog can be different.

11 sources

Official warnings

Warnings from each country's weather and warning services, with their official text. Our server fetches them, never your browser.

  • Official alerts in the U.S.

    National Weather Service (NWS)
    Live

    The alerts in effect around each U.S. place: hazardous seas, gales, coastal flooding, rip currents, hurricanes and severe weather. Our server requests them (never your browser) and each alert links to its official page.

    License
    public domain.
    Credit
    Alerts from the U.S. National Weather Service (NOAA).

    The alerts bar is a summary: before heading out on the water, always read the full alert on the NWS website.

  • Official alerts in Spain

    AEMET OpenData
    Live

    Meteoalerta warnings around each place in Spain: coastal hazards, wind, thunderstorms, rain and fog.

    Credit
    © AEMET, with the time each warning was issued.

  • Official alerts in Canada

    Environment and Climate Change Canada (Meteorological Service of Canada)
    Live

    The alerts in effect around each place in Canada: gales and strong winds at sea, freezing spray, storm surge, wind, rain, fog and thunderstorms. Our server requests them (never your browser) from the Meteorological Service of Canada's open data; we show their official title and text, unchanged, and each alert links to the official page.

    Credit
    Data Source: Environment and Climate Change Canada.

    The alerts bar is a summary: before heading out on the water, always read the full alert on the Environment Canada website.

  • Official warnings in Europe

    EUMETNET – MeteoAlarm
    Live

    Warnings from Europe's national weather services (Met Office, MET Norway, Met Éireann, Météo-France, IPMA…) that affect each place: coastal events, wind, thunderstorms, rain, fog and flooding, with their official text unchanged. Each warning names the service that issued it and when, and links to its page on meteoalarm.org. For now they appear in the United Kingdom, Sweden, Estonia, Ukraine, Slovenia and Israel, with the area each warning carries, and in Portugal (including Madeira and the Azores), Ireland, Italy, Croatia, France, Poland, Lithuania, Greece, Denmark, Malta, Belgium, Cyprus, Montenegro, Latvia, Bulgaria, Romania and Bosnia, where the shape of each warning area, sea areas included, comes from MeteoGate, EUMETNET's open data platform. Warnings for Norway, Germany and Finland come from each service's own feed (see “Official warnings from more countries”); MeteoAlarm is used only if that feed fails.

    Credit
    EUMETNET – MeteoAlarm (meteoalarm.org), with the warnings of each national weather service, named on each warning with its time of issue. Warning area shapes: EUMETNET – MeteoGate (MeteoAlarm License, CC BY 4.0).
    • MeteoGate (EUMETNET): The shape of each warning area in Portugal, Ireland, Italy, Croatia, France, Poland, Lithuania, Greece, Denmark, Malta, Belgium, Cyprus, Montenegro, Latvia, Bulgaria, Romania and Bosnia. “MeteoAlarm License” (CC BY 4.0): free use, commercial included, crediting EUMETNET – MeteoAlarm, the issuing service and the time of issue. (api.meteogate.eu)

    Time delays between this website and the www.meteoalarm.org website are possible. For the most up-to-date awareness information as published by the participating National Meteorological and Hydrological Services, please refer to www.meteoalarm.org.

  • Official warnings from more countries

    National weather services (CAP feeds)
    Live

    Warnings in effect that affect each place in the Philippines, Germany, Finland, Norway, Argentina, Colombia, Iceland, Jamaica, Barbados, Algeria and Brazil, taken from the alert (CAP) feed of each country's own weather service: tropical cyclones, storm surge and high water, high waves, wind at sea and on land, thunderstorms, heavy rain, fog and heat. We show their official title and text unchanged, in the page's language when the service provides it (otherwise in English or in their own language; Brazil's, which come in Portuguese, with a title of ours and their official name next to it), and each warning names the issuer and the time of issue and links to its official page. Our server requests them (never your browser). In Germany, Finland and Norway they come before MeteoAlarm, which is used only if their feed fails.

    Credit
    Each warning names the issuing service, with its time of issue, its license and a link to its page. Germany: “Quelle: Deutscher Wetterdienst”; the shapes of its areas, © GeoBasis-DE / BKG. Norway: “Data from MET Norway”. Brazil: “Fonte: Instituto Nacional de Meteorologia (INMET)”.
    • Philippines · PAGASA: Tropical cyclone wind signals, by province. “Licensed under CC BY 4.0” in its feed. (CAP feed)
    • Germany · Deutscher Wetterdienst (DWD): Gales on the North Sea and the Baltic, wind, thunderstorms, rain, fog and heat. CC BY 4.0 under its terms (its feed says “public domain”, which is not a licence). (terms)
    • Finland · Finnish Meteorological Institute (FMI): Wind and waves at sea, wind, thunderstorms, rain and heat, in English, Finnish and Swedish. “Licensed under Creative Commons BY 4.0” in its feed. (CAP feed)
    • Norway · MET Norway: Gales at sea, storm surge, wind, rain and thunderstorms, in English and Norwegian. NLOD 2.0 and CC BY 4.0. (license)
    • Argentina · Servicio Meteorológico Nacional: Thunderstorms, rain, wind and heat, in Spanish. “Licencia CC BY 4.0” in its feed. (CAP feed)
    • Colombia · IDEAM: High tide and rainy weather on the Caribbean and Pacific coasts, in Spanish and English. “Licensed under CC BY 4.0” in its feed. (CAP feed)
    • Iceland · Icelandic Meteorological Office (IMO): “Licensed under Creative Commons BY 4.0” in its feed. (CAP feed)
    • Jamaica · Meteorological Service of Jamaica: “Licensed under CC BY 4.0” in its feed. (CAP feed)
    • Barbados · Department of Emergency Management: “Licensed under CC BY 4.0” in its feed. (CAP feed)
    • Algeria · Office National de la Météorologie: Rain, thunderstorms, wind and heat by wilaya, in French and English. “Licensed under CC BY 4.0” in its feed. (CAP feed)
    • Brazil · Instituto Nacional de Meteorologia (INMET): Thunderstorms, heavy rain, strong winds, coastal winds, high surf (ressaca) and heat waves, in Portuguese, with the shape of the area and its municipalities. Its feed: “O conteudo deste site, podera ser reproduzido desde que citada a fonte” (content may be reproduced with credit to the source); its gov.br website, CC BY-ND 3.0. (CAP feed)

    The alerts bar is a summary: before heading out on the water, always read the full warning on the website of the service that issued it.

  • Official alerts in Taiwan

    Central Weather Administration (CWA, 中央氣象署), open data
    Live

    Warnings in effect that affect each place in Taiwan, its islands, Penghu, Kinmen and Matsu: typhoons, heavy rain, strong winds on land, dense fog and heat, by county or by township. They come in Chinese: in the alerts bar we give their type, their level and what it means under CWA’s definitions in the page’s language, plus their official text in Chinese, unchanged. Our server requests them (never your browser) every 5 minutes, and each warning links to CWA’s official page. The township of each place comes from GeoNames.

    Credit
    Data Providing Organization: Central Weather Administration (CWA), Ministry of Transportation and Communications of Taiwan (“提供機關／交通部中央氣象署”), datasets “天氣特報-豪大雨特報”, “天氣特報-陸上強風特報”, “天氣特報-濃霧特報”, “天氣特報-高溫資訊” and “颱風消息與警報-颱風警報”. The Open Data is made available to the public under the Open Government Data License, User can make use of it when complying to the condition and obligation of its terms.
    • Taiwan government open data portal: The text of the Open Government Data License, version 1.0. (license)
    • CWA open data platform: Its terms of use, which ask for this attribution on each warning and on this page. (terms)

    The alerts bar is a summary: before heading out on the water, always read the full warning on CWA’s website. Typhoon warnings for sea areas that come without their shape are not placed on a specific place (the typhoon still shows through the global feeds).

  • Official alerts in overseas France

    Météo-France, weather vigilance (“Données Publiques Vigilance” API)
    Live

    The vigilance in effect for each place in French Polynesia, New Caledonia, Guadeloupe, Martinique, French Guiana, Réunion, Mayotte, Saint Martin, Saint Barthélemy and Saint Pierre and Miquelon: wind, heavy rain and thunderstorms, waves and coastal flooding, heavy swell and cyclones, with their level (yellow, orange, red and, for cyclones, purple and grey). They come in French: in the alerts bar we give the hazard, the level and what it means under Météo-France’s definitions in the page’s language, plus the official title and bulletin in French, unchanged. Our server requests them (never your browser) every 5 minutes, and each alert links to the territory’s vigilance page. The zone of each place: in French Polynesia, its archipelago (the zones on Météo-France’s bulletin map); in New Caledonia, its commune (from GeoNames); in Réunion and Mayotte, its stretch of coast; in Guadeloupe, Martinique, French Guiana, Saint Martin and Saint Barthélemy, its stretch of coast for waves (the zones on the vigilance maps of Météo-France’s websites; the names of those stretches are ours) and, in French Guiana, also its inland zone; in Saint Pierre and Miquelon, the whole territory.

    Credit
    Source: Météo-France (weather vigilance). Each alert shows when it was issued.

    The alerts bar is a summary: before heading out on the water, always read the full bulletin on the territory’s vigilance website. Wallis and Futuna has no vigilance in Météo-France’s API.

  • Official alerts in Japan

    Japan Meteorological Agency (JMA, 気象庁), disaster prevention information XML (気象庁防災情報XML)
    Live

    Warnings (警報), advisories (注意報), level 4 urgent warnings (危険警報) and emergency warnings (特別警報) in effect for each place in Japan, by municipality: high waves, storm surge, wind and snowstorms, heavy rain, landslides, snow, thunderstorms and fog, with the figures forecast for the municipality (wave height, wind on land and at sea, snow or rain) in the units you choose. And the tsunami warnings for its stretch of coast (津波予報区): Major Tsunami Warning (大津波警報), Tsunami Warning (津波警報), Tsunami Advisory (津波注意報) and Tsunami Forecast (津波予報, slight sea-level change), with the estimated maximum height, the arrival time of the first wave and the earthquake. They come in Japanese: in the alerts bar we give their name in the page’s language (in English, the one in the JMA’s official multilingual dictionary), what each level means and their official text in Japanese. Our server requests them (never your browser): the municipal warnings every 5 minutes and the tsunami ones every minute; each warning links to the JMA’s official page. The municipality and stretch of coast of each place come from the JMA’s official warning areas (their GIS shapes), with their English names from the same dictionary.

    Credit
    出典：気象庁ホームページ (https://www.jma.go.jp/). Source: Japan Meteorological Agency. TidePlanet has processed the warnings (those for each municipality and stretch of coast, with their names translated and their figures in other units): this is not an official JMA publication.
    • JMA website terms of use: The license of its content and how to cite it. (terms)
    • JMA XML: notes on use: What the JMA asks for when republishing its warnings. (PDF)

    The alerts bar is a summary: before heading out on the water, always check the warnings on the JMA’s website. If the JMA does not respond, Japan gets the Pacific tsunami messages from tsunami.gov instead.

  • Tropical cyclones (hurricanes and typhoons)

    NOAA (NHC and CPHC) and JTWC
    Live

    Active cyclones worldwide: their strength, where they are, where they are heading and their forecast track. They appear in a place's alerts bar if their center is less than 300 miles (500 km) away, if the place is inside the 5-day forecast cone or if tropical-storm-force winds may reach it, each with a link to its official advisory. Those in the Atlantic, the Caribbean, the Gulf of Mexico and the eastern and central Pacific come from the U.S. National Hurricane Center (NHC) and Central Pacific Hurricane Center (CPHC); those in other seas from the U.S. Joint Typhoon Warning Center (JTWC). Our server fetches them every 10 minutes. For Mexico, Central America and the Caribbean we also show the official hurricane and tropical storm watches and warnings for each stretch of coast (issued by each country and gathered by the NHC in its advisories), shown in the alerts bar of the places on that stretch.

    Credit
    National Hurricane Center and Central Pacific Hurricane Center (NOAA/NWS); Joint Typhoon Warning Center (U.S. Navy and Air Force).

    A summary so you know there is a cyclone nearby: the official warning for each place is the one from its country's weather service. In the U.S. and its territories, a cyclone only appears while the NWS has no warning for it yet.

  • Tsunami messages

    tsunami.gov (NTWC and PTWC, NOAA)
    Live

    Tsunami threat messages from the Pacific Tsunami Warning Center (PTWC) for the Pacific and the Caribbean that name the place's country, and in Canada, warnings from the U.S. National Tsunami Warning Center (NTWC). They appear while they are in effect (until the final message), with the forecast wave height and a link to the official message. Our server fetches them every 3 minutes.

    Credit
    U.S. National Tsunami Warning Center and Pacific Tsunami Warning Center (NOAA/NWS), tsunami.gov.

    PTWC messages are meant for each country’s authorities, who decide the alert level: always follow what yours say. In the U.S. and its territories, tsunami alerts come through the NWS, and in Japan through the JMA.

  • Recent strong earthquakes

    U.S. Geological Survey (USGS)
    Live

    Earthquakes of magnitude 6 or more in the last 24 hours (48 if 7.5 or more) near each place: within 125 miles (200 km) for magnitude 6, 250 miles (400 km) for 7, 620 miles (1,000 km) for 7.6 and 1,860 miles (3,000 km) for 7.9 or more (the scale the PTWC uses for how far a tsunami can reach); deep ones only within 125 miles (200 km). Each links to its USGS event page. Our server fetches them every 5 minutes.

    Credit
    Earthquake data courtesy of the U.S. Geological Survey.
5 sources

Sea: buoys and seabed

What nearby buoys and satellites are measuring and the shape of the seabed off each place.

  • Water temperature measured by satellite

    NASA JPL: MUR analysis (JPL MUR MEaSUREs), via PO.DAAC
    Live

    Yesterday's water temperature at the nearest point of sea to each place (within 5 km, offshore and with no land in between), in 1 km detail. It is a daily analysis built from satellites (MODIS, AVHRR, VIIRS…) and buoys of the “foundation” temperature: the water just below the surface, without the warming of the sunny hours. It comes out a day late; we update it daily and show it next to the model forecast, on the water temperature page and in the sea section, without mixing them.

    Credit
    JPL MUR MEaSUREs Project. 2015. GHRSST Level 4 MUR Global Foundation Sea Surface Temperature Analysis (v4.1). Ver. 4.1. PO.DAAC, CA, USA. Dataset accessed daily at https://doi.org/10.5067/GHGMR-4FJ04. These data were provided by JPL under support by NASA MEaSUREs program.

    In an estuary, a ria or a narrow bay there may be no 1 km patch of water nearby: then it does not show. On sunny afternoons the top of the water can be a little warmer than this measurement.

  • Buoys

    NOAA National Data Buoy Center (NDBC)
    Live

    The latest reading from the buoy or marine station closest to each place (within 60 km, about 37 miles), in the U.S., Canada, the Caribbean and the Pacific: wave height, period and direction, wind, and water and air temperature.

    License
    public domain.
    Credit
    Data from the NOAA National Data Buoy Center. Some stations belong to its partners (IOOS regional observing systems) and are published through NDBC. CDIP wave buoys: data courtesy of CDIP (Coastal Data Information Program, Scripps Institution of Oceanography).
    • Canada: Environment and Climate Change Canada buoys come through NDBC under its data license, which allows commercial use with credit (“Data Source: Environment and Climate Change Canada”).
    • CDIP: The wave buoys of the Coastal Data Information Program at Scripps Institution of Oceanography (California, Hawaii, Guam, Saipan, American Samoa, Palau, Micronesia, the Marshall Islands…) come through NDBC. CDIP data are freely available for public use, unaltered, with a link to the CDIP website. (CDIP data use)

    From NDBC we do not show the stations from other countries (Met Office, Korea, North Sea platforms…), because it does not give their license. Korea and others come through the WMO global network (below). Nor do we show the Backyard Buoys (American Samoa, Saipan and Washington): their license (CC BY-NC 4.0) does not allow commercial use.

  • Buoys in Europe and the rest of the world

    Copernicus Marine Service (in situ product)
    Live

    The latest reading from the buoy or platform closest to each place outside the U.S. (within 60 km, about 37 miles), from the agencies that share their data through Copernicus: wave height, period and direction, water temperature and wind. Readings arrive 2 to 4 hours late; we update them every hour.

    Credit
    Generated using E.U. Copernicus Marine Service Information. Global Ocean In-Situ Near-Real-Time Observations, doi:10.48670/moi-00036. We also credit the owner of each buoy.

    In Spain we do not show the Puertos del Estado buoys: its terms ask for permission for commercial use. We do show those from other agencies, such as Euskalmet.

  • Buoys from the WMO global network

    NOAA Observing System Monitoring Center (OSMC)
    Live

    The latest reading from the buoys and tide gauges that weather services share through the World Meteorological Organization network (GTS), mainly where the other sources do not reach: South Korea, Australia, India, Hong Kong… It gives wave height (no period or direction), water temperature and wind. Readings arrive 1 to 4 hours late; we update them every hour.

    Credit
    Data from the WMO global network (GTS), via the NOAA Observing System Monitoring Center. We also credit the owner of each buoy or, if unknown, its country.
    • WMO data policy: Resolution 1 (Cg-Ext(2021)): marine observations are core data, exchanged free and unrestricted, with no conditions on use. (resolution)

    We leave out those already shown through NDBC or Copernicus and, in Spain, the Puertos del Estado buoys.

  • Water depth

    EMODnet Bathymetry, NOAA Coastal Relief Model and NOAA ETOPO 2022
    Live

    The depth profile off each place: how deep the water gets from the shoreline out to 3 miles (5 km), in the direction the coast faces, and how far out it reaches 16, 33, 66 and 164 ft (5, 10, 20 and 50 m). In Europe it comes from EMODnet (cells of about 115 m), in the U.S. from the NOAA Coastal Relief Model (about 90 m; 30 m in Southern California) and elsewhere from ETOPO 2022 (about 450 m). When the data is too coarse for that stretch of coast we say so, and if it is not reliable we do not show it. For reference only: not for navigation.

    Credit
    EMODnet Bathymetry Consortium (2024): EMODnet Digital Bathymetry (DTM 2024). NOAA National Centers for Environmental Information: U.S. Coastal Relief Model and ETOPO 2022.
    • EMODnet Bathymetry DTM 2024 (Europe): CC BY 4.0; depth at the lowest astronomical tide (LAT). (DOI)
    • NOAA U.S. Coastal Relief Model (U.S.): Public domain, a work of the U.S. Government. (DOI)
    • NOAA ETOPO 2022 (rest of the world): CC0 1.0 (public domain). Offshore it includes the GEBCO grid. (DOI)
8 sources

Beaches

Beaches and their facilities, water quality, lifeguards, rip currents and webcams.

  • Beaches and facilities

    OpenStreetMap (via Overpass and, outside the U.S. and Spain, via Overture Maps)
    Live

    Named beaches near each place, in every coastal country: surface, length, which way they face, lifeguards, restrooms, showers, parking, wheelchair access, dogs and nudity. A missing facility means we do not know, not that there is none. Well-known beaches (the ones with a Wikidata entry) have their own page.

    License
    ODbL 1.0
    Credit
    © OpenStreetMap contributors (ODbL).

  • Well-known beaches

    Wikidata
    Live

    Which beaches, piers, jetties and inlets are well known (the ones with a Wikidata entry get their own page here), their names in English and Spanish and, for piers, their length and year built when the entry has them.

    Credit
    Data from Wikidata (CC0).

  • Bathing water quality

    European Environment Agency (EEA), with data from each country’s authorities (in Spain, the Ministry of Health, Náyade)
    Live

    The official rating of each bathing site (excellent, good, sufficient or poor) for the last season, with its official page. In the coastal EU countries and Albania (the UK, Ireland in season, Australia, Hong Kong and Taiwan are in the next cards); the rest of the world has no equivalent open data.

    Credit
    Source: European Environment Agency (EEA), Bathing Water Directive (2006/7/EC) data, 2025 season; data and coordinates from each country’s authorities (in Spain, Ministry of Health, Náyade).
    The 28 official U.S. beach advisory websites we link to
    • Alabama: Coastal Alabama Beach Monitoring Program (Alabama Department of Environmental Management and Department of Public Health)
    • Alaska: Alaska Beach Monitoring Program (Alaska Department of Environmental Conservation)
    • American Samoa: Beach Monitoring Program (American Samoa Environmental Protection Agency)
    • California: Beach Program (California State Water Resources Control Board)
    • Connecticut: Public Beaches (Connecticut Department of Public Health)
    • Delaware: Delaware Recreational Waters (Delaware Department of Natural Resources and Environmental Control, DNREC)
    • Florida: Florida Healthy Beaches Program (Florida Department of Health)
    • Georgia: Georgia Healthy Beaches (Georgia Department of Natural Resources, Coastal Resources Division)
    • Guam: Beach Report (Guam Environmental Protection Agency)
    • Hawaii: Beach Monitoring Program (Hawaii Department of Health, Clean Water Branch)
    • Louisiana: Beach Monitoring Program (Louisiana Department of Health)
    • Maine: Maine Healthy Beaches Program (Maine Department of Environmental Protection)
    • Maryland: Maryland Healthy Beaches (Maryland Department of the Environment)
    • Massachusetts: Beach Water Quality (Massachusetts Department of Public Health)
    • Mississippi: Mississippi Beach Monitoring Program (Mississippi Department of Environmental Quality)
    • New Hampshire: Public Beach Inspection Program (New Hampshire Department of Environmental Services)
    • New Jersey: Cooperative Coastal Monitoring Program (New Jersey Department of Environmental Protection)
    • New York: Coastal Beach Water Quality (New York State Department of Health)
    • North Carolina: N.C. Recreational Water Quality Program (North Carolina Department of Environmental Quality)
    • Northern Mariana Islands: Beach Advisories (CNMI Bureau of Environmental and Coastal Quality)
    • Oregon: Oregon Beach Monitoring Program (Oregon Health Authority)
    • Puerto Rico: Beach Monitoring and Public Notification Program (Puerto Rico Department of Natural and Environmental Resources)
    • Rhode Island: Beach Monitoring Program (Rhode Island Department of Health)
    • South Carolina: S.C. Beach Guide, beach map with swimming advisories (South Carolina Department of Environmental Services)
    • Texas: Texas Beach Watch (Texas General Land Office)
    • U.S. Virgin Islands: Beach Advisories (Virgin Islands Department of Planning and Natural Resources)
    • Virginia: Beach Monitoring Program: swimming advisories map (Virginia Department of Health)
    • Washington: BEACH Program (Washington State Department of Ecology)

    The U.S. and its territories have no open yearly rating: on beach pages we link to each state's or territory's official beach advisory website (its beach monitoring program, funded by the EPA's BEACH Act grants). We don't copy the advisories, and we check the links every month.

  • UK bathing water quality

    Environment Agency (England), Natural Resources Wales (Wales), SEPA (Scotland) and DAERA (Northern Ireland)
    Live

    The official rating of each coastal bathing water (excellent, good, sufficient or poor) for the 2025 season, with its official page. The UK no longer reports to the European Environment Agency, so each nation publishes its own. We match each bathing water to the OpenStreetMap beaches by distance and name; one with no named beach nearby appears as a beach of its own, with its official name and sampling point. We do not show the weekly samples or the daily forecasts of the season yet.

    Credit
    Contains public sector information licensed under the Open Government Licence v3.0. Sources: Environment Agency, Natural Resources Wales, SEPA and DAERA, 2025 season.
    • England: Environment Agency, “Bathing Waters Monitoring Locations”. © Environment Agency copyright and/or database right 2015. All rights reserved. (dataset)
    • Wales: Natural Resources Wales, “Designated Bathing Water Quality” (DataMapWales, Welsh Government). Contains public sector information licensed under the Open Government Licence v3.0. (dataset)
    • Scotland: Scottish Environment Protection Agency (SEPA), “Bathing Water Points”. © SEPA. Contains public sector information licensed under the Open Government Licence. (SEPA data)
    • Northern Ireland: DAERA, ratings from its website and bathing water areas from OpenDataNI. Contains public sector information licensed under the Open Government Licence v3.0. (DAERA)

  • Bathing water in Ireland, Australia, Hong Kong and Taiwan

    Irish EPA (beaches.ie), Beachwatch (NSW Government), EPA Victoria, Hong Kong Environmental Protection Department (EPD) and Taiwan’s Ocean Conservation Administration (OCA)
    Live

    In New South Wales, the yearly grade of each swim site (Very Good to Very Poor, from the State of the Beaches report; the 2026 one covers the 2025-26 season) and, every day, the pollution forecast and the latest sample. In Ireland, the notices in force (swimming prohibited or advised against) and the latest sample at each bathing site, including the ones councils monitor outside the EU list; the notices also show in the alerts bar and the beach day card of places with that beach nearby. In Melbourne and Port Phillip Bay, the latest enterococci sample (September to May). In Hong Kong, the weekly grade. In Taiwan, the latest summer sample. Seasonal data is checked every hour and only shows with its date and while it is valid: a sample for 14 days, the Hong Kong grade for 14, the forecast on its own day. We match it to the OpenStreetMap beaches by distance and name; sea bathing sites with no named beach nearby are a beach of their own, under their official name.

    Credit
    Sources: Irish EPA; Beachwatch, NSW Government; EPA Victoria (CC BY 4.0); Hong Kong EPD and DATA.GOV.HK; Taiwan Ocean Conservation Administration (Open Government Data License 1.0).
    • Ireland: Environmental Protection Agency (EPA), OpenData Bathing Water API (beaches.ie). Licensed under CC BY 4.0. (dataset)
    • New South Wales: Beachwatch, Department of Climate Change, Energy, the Environment and Water, NSW Government: State of the Beaches and pollution forecasts. Licensed under CC BY 4.0. (Beachwatch data feeds)
    • Victoria: EPA Victoria, EPA Beach Report enterococci data (DataVic). Licensed under CC BY 4.0. The enterococci colors are ours: low up to 40, moderate up to 200 and high above, per 100 mL (the Australian guideline cut-offs, NHMRC 2008). (dataset)
    • Hong Kong: Source: Environmental Protection Department, HKSAR Government; DATA.GOV.HK (Beach Water Quality Grading). (dataset)
    • Taiwan: Ocean Conservation Administration, Ocean Affairs Council, 2025, Beach water quality (海域水質). The Open Data is made available to the public under the Open Government Data License, User can make use of it when complying to the condition and obligation of its terms. (dataset)

  • RNLI lifeguards

    RNLI (Royal National Lifeboat Institution), RNLI Open Data
    Live

    The beaches in the UK and Jersey with RNLI lifeguards in season, linking to each beach on the RNLI website (dates and times). We match them to the OpenStreetMap beaches by distance and name: where OpenStreetMap already showed a lifeguard, it appears only once. We do not change their data, and the RNLI is not connected with TidePlanet.

    Credit
    Contains Open Data licensed under the GIS Open Data Licence.

  • Rip currents in the U.S.

    NOAA / National Weather Service (NWS): beach forecast
    Live

    Today's and tomorrow's rip current risk (low, moderate or high) for each stretch of beach in the U.S., Puerto Rico and the U.S. Virgin Islands, from each NWS office's beach forecast. It appears on the Beach and Surf pages of places within 3 miles (5 km) of a stretch with a forecast, with a safety tip and a link to the official forecast; on Surf pages, also the NWS surf height. Out of season many offices don't issue it, and then we show nothing. If a rip current statement is in effect, that day shows as high risk. Our server requests it once an hour for the whole country (never your browser).

    Credit
    NOAA / National Weather Service, Marine Beach Forecast Summary.

    It's a summary: always follow the lifeguard's flags and read the full forecast on the NWS website.

  • Webcams

    Windy (windy.com Webcams API)
    Live

    The webcams closest to each beach, with their current image, how far they are and a link to their page on Windy, where you can watch today's timelapse. Windy serves the images straight to your browser; we only keep the list for a few minutes.

    Credit
    Webcams provided by windy.com.
6 sources

Fishing

Where to fish, which species are seen nearby and artificial reefs.

  • Where to fish

    OpenStreetMap (via Overpass and Overture Maps) and Overture Maps
    Live

    Piers, jetties, boat ramps, harbors and tackle shops near each place, in every coastal country, with distances.

    Credit
    © OpenStreetMap contributors (ODbL). Contains data from the Overture Maps Foundation.

  • Boat ramp facilities in New South Wales and Florida

    Transport for NSW (Maritime NSW Boat Ramps) and FWC (FWC Florida Boat Ramp Inventory)
    Live

    For boat ramps in New South Wales (Australia) and Florida, what the official lists say: lanes, car and trailer spaces, restrooms, fish-cleaning table, pontoon or dock, fuel, lighting, whether there is a fee, its condition and, in New South Wales, whether you can only launch at high tide. We match them to OpenStreetMap ramps within 150 m (or 300 m if the names are alike); those OpenStreetMap does not have show up as new ramps. We leave out kayak launches and restricted ramps. We update them once a month.

    Credit
    Contains data from Transport for NSW (“Maritime NSW Boat Ramps”, CC BY 4.0). Florida: FWC-FWRI (Florida Fish and Wildlife Conservation Commission – Fish and Wildlife Research Institute), “FWC Florida Boat Ramp Inventory”.
    • New South Wales: Dataset record on the Transport for NSW Open Data Hub. (record)
    • Florida: FWC layer, with its metadata: not legal documents and not for navigation. (layer)

    A facility that is not listed means the list does not say, not that there is none. Before you go, check the ramp’s status with whoever runs it.

  • Fish species

    GBIF (Global Biodiversity Information Facility), with OBIS data
    Live

    Which sport fishing species have been recorded near each place and in which months they are seen most: sightings and catches reported by divers and anglers, scientific surveys and museum collections, since 1970. We start from a list of 150 sport fishing species from around the world and count their records within about 30 km (19 mi) of each place (100 km, 62 mi, where there are few). The months come from sightings only, adjusted for how many there are each month. These are records, not a promise of a catch.

    Credit
    GBIF.org, occurrence download (October 2026; its DOI is below), with records from more than 1,100 datasets; OBIS data reaches GBIF through its network. Common names of the species: Wikidata (CC0), checked by hand.
    GBIF download
    GBIF.org (October 24, 2026) GBIF Occurrence Download https://doi.org/10.15468/dl.xymkee
    • ICES Trawl Survey Datasets (DATRAS): ICES bottom trawl surveys in the Northeast Atlantic. CC BY 4.0. (DOI)
    • PISCO Kelp Forest Community Surveys: Diver surveys in the kelp forests of California. CC BY 4.0. (DOI)
    • iNaturalist Research-grade Observations: Community-verified observations by naturalists; only those licensed CC0 or CC BY. (DOI)
    • NOAA (U.S.): Surveys and fishing logbooks from the Southeast and Northeast Fisheries Science Centers. Public domain (CC0). (DOI)

    Our server downloads the records from GBIF every three months; your browser never connects to GBIF.

  • Species photos

    Wikimedia Commons (each species' image on Wikidata) and GBIF
    Live

    A photo or drawing of each of the 150 species in “What can you catch”, with its author, its licence and a link to its page right next to it. It is the image Wikidata's editors chose for the species (hosted on Wikimedia Commons); if none has a suitable licence, a photo from a GBIF observation.

    Credit
    The author and licence of each photo, next to the photo, with a link to its page on Wikimedia Commons or GBIF.

    Our server stores and serves the thumbnails (refreshed every three months); your browser never connects to Wikimedia or GBIF.

  • What anglers catch most in the U.S.

    NOAA Fisheries, Marine Recreational Information Program (MRIP)
    Live

    On the Fishing page of places in the Atlantic coast states from Maine to Florida, Alabama, Mississippi and Hawaii, the species anglers catch most in the state (in Florida, on its Atlantic coast or on the Gulf coast and Keys) every two months: from shore, from private or rental boats and from charter or party boats, with fish a year (average of the last 5 complete years) and the share released. These are estimates from a survey of anglers, with their error: we only show those that meet NOAA’s standard (relative standard error up to 50%) and mark those above 30%, which NOAA advises using with caution. Bait fish are left out. Louisiana, Texas and the Pacific states run their own surveys, which we do not use.

    Credit
    NOAA Fisheries, Marine Recreational Information Program (MRIP): wave-level catch estimates. Courtesy: National Oceanic and Atmospheric Administration.

    Our server checks once a month whether NOAA has published new data (it does so once a year); your browser never connects to NOAA.

  • US artificial reefs

    NOAA Office for Coastal Management and BOEM (MarineCadastre.gov); Florida: FWC
    Live

    Artificial reefs in 18 states and territories (sunken ships, concrete modules, rock, vehicles…) with their name, material, year and depth. Pieces of the same reef are merged into one. For Florida we use the FWC list, up to date to 2026; elsewhere, MarineCadastre (2022). We leave out North Carolina’s oyster sanctuaries. They show on the Fishing page and, down to 60 m, on the Diving page. Positions are approximate and not for navigation.

    Credit
    NOAA Office for Coastal Management and Bureau of Ocean Energy Management, “Artificial Reefs” (MarineCadastre.gov, 13 September 2022): a U.S. Government work, not subject to copyright protection in the United States. Florida: FWC-FWRI (Florida Fish and Wildlife Conservation Commission – Fish and Wildlife Research Institute) and FWC Division of Marine Fisheries Management, “Artificial Reef Locations in Florida”.
    • MarineCadastre: NOAA record (InPort 54191). (record)
    • FWC: FWC open data: not legal documents and not for navigation. (record)
5 sources

Diving

Dive sites, dive centers, wrecks and reefs.

  • Diving

    OpenStreetMap (via Overpass and Overture Maps) and Overture Maps
    Live

    Dive sites, dive shops, wrecks and marine protected areas near each place.

    Credit
    © OpenStreetMap contributors (ODbL). Contains data from Overture Maps Foundation.

  • Wrecks

    EMODnet Human Activities, from UK Hydrographic Office data; in the US, NOAA nautical charts
    Live

    Shipwrecks worldwide (in the US, those from NOAA nautical charts, below; Australia has almost none) with their name, depth (from the top of the hull to the seabed), type of vessel and the year they sank. The Diving page shows those shallower than 60 m; the Fishing page lists them as boat fishing spots. We leave out wrecks the UKHO lists as gone, lifted or doubtful. Positions are approximate and not for navigation.

    Credit
    This data was downloaded from the EMODnet Portal (https://emodnet.ec.europa.eu/en/). The data originator is AND-International. “EMODnet Human Activities, Worldwide wrecks locations (UK Hydrographic Office)”, version of 26 December 2024. Contains public sector information licensed under the Open Government Licence v3.0.
    • Open Government Licence v3.0: The licence of the original UK Hydrographic Office data: commercial use is allowed with attribution. (licence)
    • US: NOAA nautical charts: Wrecks from NOAA electronic navigational charts (ENC) at harbor, approach and coastal scales, with the sounding over the wreck and its name when it has one, via the “ENC Direct to GIS” service. A U.S. Government work (public domain); not for navigation: use the official charts for that. (NOAA)

  • Reef Life Survey dive sites

    Reef Life Survey and IMOS – National Reef Monitoring Network (Australia)
    Live

    Dive sites in more than 50 countries surveyed by volunteer and scientific divers, with their name, the depth of the surveys and the fish seen most often at each one. Positions are accurate to about 1 km. Fish common names come from our species list or from Wikidata (CC0); where there is none, we show the scientific name.

    License
    CC BY 4.0.
    Credit
    Reef Life Survey (RLS); Institute for Marine and Antarctic Studies (IMAS); Parks Victoria; Department of Primary Industries (DPI), New South Wales Government; Parks and Wildlife Tasmania; Department for Environment and Water (DEWNR), South Australia; Integrated Marine Observing System (IMOS), 2026: IMOS – National Reef Monitoring Network Sub-Facility – Site information and Global reef fish abundance and biomass, https://catalogue-imos.aodn.org.au, accessed 25 October 2026. Data was sourced from Australia’s Integrated Marine Observing System (IMOS) – IMOS is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS).
    • Sites: IMOS – NRMN – Site information (CC BY 4.0). (record)
    • Fish: IMOS – NRMN – Global reef fish abundance and biomass (CC BY 4.0). (record)
    • Paper: Edgar, G. J. and Stuart-Smith, R. D. (2014): Systematic global assessment of reef fish communities by the Reef Life Survey program. Scientific Data 1, 140007. (DOI)

  • Coral bleaching alerts

    NOAA Coral Reef Watch (5 km Regional Virtual Stations, version 3.1)
    Live

    For places near coral reefs (inside one of its 219 reef areas: roughly 20 km or less from a reef), the bleaching alert level for that area (no stress, watch, warning, alert level 1 or 2), the heat built up over the last 12 weeks (Degree Heating Weeks) and how far the water is above or below normal. It comes from satellites, with 5 km pixels and about a 2-day lag; we update it daily and show it on the Diving page.

    Credit
    NOAA Coral Reef Watch. 2018, updated daily. NOAA Coral Reef Watch Version 3.1 Daily Global 5km Satellite Coral Bleaching Heat Stress Monitoring Product Suite (Regional Virtual Stations). College Park, Maryland, USA: NOAA Coral Reef Watch. Data set accessed daily at https://coralreefwatch.noaa.gov/product/vs/data.php.
    • How to cite: Coral Reef Watch recommendations for citing its data. (CRW page)
    • Paper: Skirving, W. et al. (2020): CoralTemp and the Coral Reef Watch Coral Bleaching Heat Stress Product Suite Version 3.1. Remote Sensing 12, 3856. (DOI)

    It covers the whole reef area, not the exact spot where you dive, and it doesn't say whether there's coral there: the dive sites on the page do.

  • Water clarity from satellite

    NOAA CoastWatch: Kd490 from the S-NPP satellite VIIRS (near real time, 4 km)
    Live

    How clear or murky the satellite saw the water within 5 km of each place, on the last cloud-free day of the last 10: the attenuation coefficient of blue light (Kd490; the higher, the murkier), in 4 km pixels and with about a 3-day lag. We show it on the Diving page, separate from today's likely visibility (which we work out from swell, rain and wind), only where the seabed drops below 20 m close to shore: in shallower water the satellite sees the bottom and makes the water look murkier than it is. It is an experimental NOAA product.

    Credit
    NOAA CoastWatch. Kd490, NOAA S-NPP VIIRS, Near Real-Time, Global 4km, Level 3, Daily (noaacwNPPVIIRSkd490Daily). NOAA NESDIS CoastWatch, accessed daily at https://coastwatch.noaa.gov/erddap/.

    With clouds there's no data, and in small coves or estuaries the 4 km pixel doesn't reach: then it doesn't show.

1 source

Surf

Surf breaks and surf schools along each coast.

  • Surf

    OpenStreetMap (via Overpass)
    Live

    Surf spots, surf beaches and surf schools near each place (sport=surfing and surfing=*). The surf score and the surf height at the shore are our own calculation from Open-Meteo’s sea and wind forecast and the way the coast faces: an estimate for the coast, not for a specific break.

    License
    ODbL 1.0.
    Credit
    © OpenStreetMap contributors (ODbL).
1 source

Sun and moon

Sun and moon times, moon phases and eclipses: we calculate them ourselves.

  • Sun and moon

    Our own calculation with astronomy-engine
    Live

    Sunrise and sunset, twilight, golden hour, moon phases and distance, eclipses and where they can be seen, and solunar periods. We calculate them ourselves for every place and every day. The path of totality of solar eclipses comes from the NASA eclipse catalog.

    License
    MIT
    Credit
    astronomy-engine, by Don Cross. Solar eclipse paths: Eclipse Predictions by Fred Espenak, NASA’s GSFC (eclipse.gsfc.nasa.gov).
5 sources

Places and maps

The name and position of each place, the coastline and the maps.

  • Places

    GeoNames
    Live

    The names, coordinates, population and province or state of every town, beach, harbor, cape and lighthouse.

    License
    CC BY 4.0
    Credit
    Contains data from GeoNames (www.geonames.org), licensed under CC BY 4.0.

  • Coastline

    OpenStreetMap, via Overture Maps and osmdata.openstreetmap.de
    Live

    Where the land ends and the sea begins. We use it to pick the places that sit on the coast. For the U.S. and Spain we download it from Overture Maps (with estuaries and inlets); for the rest of the world, from osmdata.

    License
    ODbL 1.0
    Credit
    © OpenStreetMap contributors. Data available under the Open Database License (ODbL). Downloaded from Overture Maps and osmdata.openstreetmap.de.

  • Lighthouses

    NGA List of Lights (National Geospatial-Intelligence Agency, USA), Wikidata and Wikimedia Commons
    Live

    The nearest lighthouse within 10 km of each place, on its page: the name, the distance, the light in plain words (“2 white flashes every 10 s”), the range, the height of the light and of the tower, the year and a photo. The lighthouses come from Wikidata (about 9,300) and, where Wikidata has none, from the lights with a range of 15 nautical miles or more in the NGA List of Lights, which corrects every week the lights of every coast in the world except the U.S. When a Wikidata lighthouse is in that list, its light, height and range are the NGA ones. We update it once a month.

    Credit
    National Geospatial-Intelligence Agency, List of Lights, Radio Aids and Fog Signals (Pub. 110–116), accessed monthly at https://msi.nga.mil/Publications/NGALOL. Data from Wikidata (CC0). Photos from Wikimedia Commons, each with its author and license.
    • NGA: NGA website policy: asks for credit. (nga.mil)
    • Wikidata: “Lighthouse” items (Q39715) with their name, heights, range, light, year and photo. (Wikidata)
    • Photos: 330 px thumbnails from Wikimedia Commons, served from our own server: viewing the page never connects your browser to Wikimedia. (Commons)

    For reference only: not for navigation. For that, use official nautical charts and notices to mariners.

  • Maps

    OpenFreeMap
    Live

    The maps on the Fishing, Beach and Diving pages. They only load when you scroll to them.

    License
    free to use with credit.
    Credit
    OpenFreeMap © OpenMapTiles. Data from © OpenStreetMap contributors.

  • World map

    Natural Earth
    Live

    The outline of the continents on the day and night map, and the coastline we use to decide which parts of the world to download.

    License
    public domain.
    Credit
    Made with Natural Earth.

Questions about the data

Why is the tide at my place marked “approximate”?

Because there is no tide station nearby: its tide comes from the global FES2022 model or, where that one does not fit, the EOT20 model (level M). Where we show it, it usually gets the times right within a few minutes, but it can be a little further off than at places with a station next door. Where the model is not reliable (estuaries, rivers, enclosed bays), we do not show the tide.

Why does the real tide not match the prediction exactly?

Because the prediction only accounts for the sun and the moon. Wind, air pressure and rivers in flood can make the tide come early or late and change its height, especially in stormy weather.

Can I use these tides for navigation?

No. They are predictions for fishing and leisure. For navigation, always use the official publications of your hydrographic service.

Which model does each hour of the weather come from?

The best one covering that spot and lead time: in the U.S., HRRR for the first 18 hours and NBM up to 11 days; in France and northern and central Spain, AROME for the first 2 days; in Europe, ICON-EU up to 5 days; then ECMWF up to day 15 and GFS for day 16. On the Weather page every hour and every day shows which model it comes from.

What do “high, medium or low confidence” mean?

We compare what up to seven models say for the next few days. If they agree on temperature, rain and wind, confidence is high; if they split (some show rain and others don't, or several degrees apart), it is medium or low and it's worth checking again closer to the day.

Spotted a number that looks wrong? Tell us and we will check it.

Settings

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Height and distance Tides, waves and distances
Temperature Air and water
Wind Speed and gusts
Time Tides, sun and moon
Pressure Air pressure
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