The BSH provides reliable, first-hand information from five modern survey vessels, which systematically register and monitor all changes in German waters. All the latest survey results and significant nautical changes are recorded in the charts, which can be used for recreational craft. The charts are updated at regular intervals. They are compiled with an international key and their contents are in German only. They cover scale ranges 1 : 12 500 to 1 : 50 000. See also www.bsh.de.