The National Oceanic and Atmospheric Administration offers water depth charts for coasts around the United States with its Office of Coast Survey website. An entire catalog of the Atlantic Coast, along with the depths of specific locations, such as Key West Harbor, Miami Harbor and Everglades National Park Whitewater Bay, are available.
The map provided from EarthNC can also be used to find ocean depths from anywhere in the world. To locate ocean depths using this map, simply click on a geographic location and view the corresponding depth. The map also gives locations of buoys and pier lights for nautical navigation.