Prepared and published by the National Imagery and Mapping Agency. Depths shown by isolines and soundings. Relief shown by spot heights. "From Mexican and British Admiralty charts to 1981." "Soundings in meters." "Copyright restrictions of the country of origin continue to exist." Includes source diagram. Map no.28260. This map is part of a collection of scanned and georeferenced nautical charts produced by the National Geospatial-Intelligence Agency (NGA). This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.