Arcgis online has been updating the map of the depths of the sea

Ocean Basemap map service in ArcGIS Online has been updated to include the General Bathymetric Chart of the Oceans GEBCO_08 grid and high-resolution bathymetry data from the National Oceanic and Atmospheric Adminstration (NOAA), National Geophysical Data Center (NGDC) specifically for the US territories. Area of land has also been updated to use data from DeLorme.

Click here to view ArcGIS Online Ocean Basemap
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