The General Chart Series consists of 13 charts covering the North Sea, the Norwegian Sea, Svalbard, the Barents Sea, the Greenland Sea, Iceland, Eastern Greenland and the North Atlantic. All charts in this series are in the Mercator projection. The scales vary from 1:600,000 to 1:10,000,000. Some of the charts form part of an International Chart Series under the auspices of the International Hydrographic Organization. The service is updated every month based on new and updated charts.