Link: OpenSeaMap - The free nautical chart
OpenSeaMap is part of OpenStreetMap
More than 1,000,000 people worldwide have collected and stored geological data in the OpenStreetMap database. This is how the basic chart and the seamark layer were rendered. Many data are donations from various sources. The ports, for example, were taken from the World Port Index, OpenStreetMap and SkipperGuide. The water depths were rendered from GEBCO data. Weather data were taken from the NOAA and rendered by Thomas. Lighthouses were found in the List of Lights and OpenStreetMap. The links to Wikipedia are from Wikipedia and images from Wikimedia Commons. The DE gauge data came from Wasser- und Schifffahrtsverwaltung (PEGELONLINE), the CH ones from Bundesamt für Umwelt, Abteilung Hydrologie. The aerial photographs are from Bing. AIS data were provided by Syros University and ship tracking date by INTERMAR and SatPro. Inland waterway data in DE are provided by Wasser- und Schifffahrtsverwaltung des Bundes (WSV). The height data (ASTA GDEM) is a product from METI and NASA provided by OpenMapSurfer of Uni Heidelberg. Depth data are collected by Crowdsourcing and computed, or are provided by third parties, e.g. from Bundesamt für Seeschifffahrt und Hydrographie (BSH).
The data are stored on Linux servers in a Postgres/PostGIS database and rendered with Mapnik or Osmarender and illustrated with OpenLayers.
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