Analysis of information sources in references of the Wikipedia article "Sailing Directions (National Geospatial-Intelligence Agency)" in German language version.
„Sailing Directions (Enroute) include detailed coastal and port approach information, supplementing the largest scale chart of the area. Each publication is subdivided into geographic regions, called sectors, which contain information about the coastal weather, currents, ice, dangers, features and ports, as well as graphic keys to standard nautical charts available for the area. The downloadable publication files include updates affecting the current edition, if any.“
„[...] include relevant physical, political, industrial, navigational and regulatory information about the countries adjacent to a particular ocean basin in a single volume. The downloadable publication files include updates affecting the current edition, if any.“
