NGA Nautical Charts
Over 600 Standard Nautical Charts (SNC) are available from NGA and covers waters outside the USA.
Large-scale charts often cover approaches and entrances to harbours, medium-scale charts cover heavily used coastal areas, and small-scale charts are for navigation in more open areas.
NOAA and NGA standard nautical charts use the Mercator projection so that bearings can be transferred to (or taken from) the charts directly.