Pacific ocean depth chart. Find marine charts for the Pacific Ocean on iBoating, a navigation app with advanced features. Pacific ocean nautical chart shows depths and hydrography on an interactive map. Explore depth map of Pacific ocean. NOAA ENCs support marine navigation by providing the official Electronic Navigational Chart used in ECDIS and in electronic charting systems. . Adjust water level offset, custom depth shading, fishing spots, relief shading and more. NOAA ENCs are updated weekly with Notice to Mariner corrections. NOAA ENCs (ENC): Vector files of chart features and available in S-57 format. Detailed depth contours provide the size, shape and distribution of underwater features. NOAA Nautical Charts - Pacific Coast Click an area on the map to search for your chart The Digital Nautical Chart (DNC) is produced by the National Geospatial-Intelligence Agency (NGA) and is a vector-based digital product containing maritime significant features essential for safe marine navigation.