Ocean data visualization

• The layer list, top right, holds the basemaps and every overlay. Only one scalar field and one current depth can show at a time — two of either over the same water cannot be told apart.
• Right-click, or press and hold on a touchscreen, to read the position, the seafloor depth and the current wherever you point. With a temperature or salinity layer on, that too; with maritime boundaries on, whose waters they are.
• The 📏 button measures distance and bearing along as many legs as you click. Escape clears it.
• Under the map: the color scale, its range, how strongly the depth contours show through, and the forecast hour. Reset puts everything back.
• Your own overlay. Load a KMZ or KML — a survey plan, a station grid, an operating area, a georeferenced chart — and it is drawn over the top and kept in this browser for next time. It stays on your machine; nothing is uploaded anywhere.

The same feeds as the tropical cyclone page, which describes each one. The models: the US Navy ESPC-D-V02 forecast for currents, temperature, salinity and sea ice; NOAA PSL OISST v2.1 for observed temperature, its anomaly against the 1991–2020 normal, and its own ice concentration; ECMWF IFS open data for 10 m wind, 2 m air temperature and total cloud cover; and ECWAM for wave height. The platforms: the Argo array via the Ifremer Argo GDAC, ocean gliders from the US IOOS Glider DAC and three other national data - [Rolling Deck to Repository](https://www.rvdata.us/) — the US academic research fleet registry, which names the vessels the GTS reports as bare call signs - [SAMOS (Florida State University)](https://samos.coaps.fsu.edu/) — one-minute underway positions from most of the academic fleet, which is what makes a vessel track a course rather than an 11 km staircase; about half a day behind, so the last hours of each track are still the GTS - [Schmidt Ocean Institute](https://schmidtocean.org/) — RV Falkor (too) relayed from the ship herself, at one minute and full precision - [SondeHub (CC BY-SA 2.0)](https://sondehub.org/) — radiosondes currently aloft, from a volunteer network of receivers rather than the WMO, so it sees about 40% of the world's twice-daily launches and almost none outside Europe, North America, Japan and Australia centers, NOAA uncrewed surface vehicles from NOAA PMEL and NOAA OSMC, the National Data Buoy Center's moored buoys and coastal stations, NOAA CO-OPS tide gauges, and the GTMBA tropical moored arrays. The National Hurricane Center supplies the storm forecasts, the tropical weather outlook and the wind speed probabilities for the Atlantic and the eastern Pacific, the Japan Meteorological Agency the typhoons of the western North Pacific with the probability circles it publishes for them, and the Joint Typhoon Warning Center the cyclones of the Indian Ocean and the southern hemisphere, and NOAA/NWS NEXRAD the radar, and NASA GIBS / NOAA GOES the satellite cloud imagery — the ABI GeoColor composite and the Band 13 clean-infrared channel, as two separate layers, reprojected to Web Mercator by NASA. Whichever satellite covers what you are looking at is the one drawn, so there is no join across the picture. For the base and the reference lines: GEBCO Compilation Group for bathymetry and depth contours, Natural Earth for the offline coastline and the borders, Esri Ocean and OpenStreetMap as alternative basemaps, EMODnet Bathymetry for the shoreline, and Marine Regions (VLIZ) for maritime boundaries. Everything but the seafloor is refetched hourly.