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INTERNATIONAL HYDROGRAPHIC ORGANIZATION
http://www.iho-ohi.net/english/home/





INTERNATIONAL FEDERATION OF HYDROGRAPHIC SOCIETIES
http://www.hydrographicsociety.org/






International Association of Marine Aids to Navigation and Lighthouse Authorities
"IALA"
http://www.iala-aism.org/






INTERNATIONAL MARINE CONTRACTORS ASSOCIATION
IMCA
http://www.imca-int.com/





INTERNATIONAL MARITIME ORGANISATION
www.imo.org