This edition of U.S. Chart No. 1 has a new name and a new look. Its title is now Symbols, Abbreviations and Terms used on Paper and Electronic Navigational Charts. For the first time, U.S. Chart No. 1 presents both of the major symbology sets used for marine navigation. As in previous editions, the symbols used on paper nautical charts produced by National Oceanic and Atmospheric (NOAA) and the National Geospatial Intelligence Agency (NGA) and digital raster representations of those charts, such as NOAA Raster Nautical Chart (NOAA RNC's), are presented in lettered sections organized in categories, such as Landmarks, Depths, and Lights. New in this edition is the inclusion of the corresponding symbols used to portray Electronic Navigational Chart (ENC) data on Electronic Chart Display and Information Systems (ECDIS) as specified by the International Hydrographic Organization (IHO). Document sections and ECDIS pages. Schematic layout -- Day, dusk and night color palettes -- Conspicuous and non-conspicuous features -- ECDIS portrayal of depths -- Examples of routing measures in ECDIS -- Simplified and traditional "paper chart" symbols -- IALA maritime buoyage system -- Symbol sections. General. Chart number, title, marginal notes -- Positions, distances, directions, compass -- Topography. Natural features -- Cultural features -- Landmarks -- Ports -- Hydrography. Tides, currents -- Depths -- Nature of the seabed -- Rocks, wrecks, obstructions, aquaculture -- Offshore installations -- Tracks, routes -- Areas, limits -- Navigation aids and services. Lights -- Buoys, beacons -- Fog signals -- Radar, radio, satellite navigation systems -- Services -- Small craft (leisure) facilities.