• 61 Maps, Atlases

• 59 Navigation
• 16 Nautical charts
• 13 Harbors
• 3 Coasts
• 1 Anchorage
• 1 International status
• 1 Jurisdiction, Territorial
• 1 Navigation v Maps
• 1 Research institutes

• 39 United States. Defense Mapping Agency. Hydrographic/Topographic Center
• 17 United States. Defense Mapping Agency
• 11 Japan. Kaijō Hoanchō. Suirobu
• 8 Deutsches Hydrographisches Institut
• 5 Germany. Bundesamt für Seeschifffahrt und Hydrographie
• 4 Australia. Hydrographic Service
• 4 France. Service hydrographique et océanographique de la marine
• 4 Netherlands. Hydrografisch Bureau
• 4 United States. National Imagery and Mapping Agency
• 3 Belgium. Service hydrographique de la côte
• 3 Instituto Hidrográfico (Portugal)
• 3 Instituto Hidrográfico de la Armada
• 2 Argentina. Servicio de Hidrografía Naval
• 2 Royal Danish Hydrographic Office
• 2 South Africa. Navy Hydrographic Office
• 1 Brazil. Direitoria de Hidrografia e Navegacao
• 1 Canadian Hydrographic Service
• 1 Geodaetisk institute (Denmark)
• 1 Germany (East). Seehydrographischer Dienst
• 1 Germany (West). Bundesamt für Seeschiffahrt und Hydrographie
• 1 Great Britain. Hydrographic Department
• 1 Great Britain. Hydrographic Office
• 1 Norges sjøkartverk
• 1 South Africa
• 1 Statens kartverk (Norway). Sjøkartverket

• 61 English
• 6 German
• 2 French
• 1 Dutch
• 1 Norwegian
• 1 Unknown

• 11 North Sea
• 7 Elbe River (Czech Republic and Germany)
• 6 France
• 6 North Atlantic Ocean
• 6 North Pacific Ocean
• 6 South Atlantic Ocean
• 5 Japan
• 5 South Pacific Ocean
• 4 English Channel
• 3 Atlantic Coast (Argentina)
• 3 Coral Sea
• 3 Indian Ocean
• 3 Norwegian Sea
• 3 Pacific Coast
• 3 Pacific Coast (Japan)
• 2 Antarctica
• 2 Atlantic Coast (Africa)
• 2 Atlantic Coast (Portugal)
• 2 Atlantic Coast (Uruguay)
• 2 Belgium
• 2 Ems River (Germany and Netherlands)
• 2 Germany
• 2 Indian Coast (Africa)
• 2 Jade Bay (Germany)
• 2 Japan, Sea of

Limit year range