International Hydrographic Organization

83 countries are members.

Country
Algeria
Argentina
Australia
Bahrain
Bangladesh
Belgium
Brunei
Cameroon
Canada
Chile
Colombia
Croatia
Cuba
Cyprus
Democratic Republic of the Congo
Dominican Republic
Ecuador
Egypt
Estonia
Fiji
Finland
France
Georgia
Greece
Guatemala
Iceland
India
Indonesia
Iran
Ireland
Jamaica
Japan
Kingdom of the Netherlands
Kuwait
Latvia
Malaysia
Malta
Mauritius
Mexico
Monaco
Montenegro
Morocco
Mozambique
Myanmar
New Zealand
Nigeria
North Korea
Norway
Oman
Pakistan
Papua New Guinea
People's Republic of China
Peru
Philippines
Poland
Portugal
Qatar
Romania
Russia
Saudi Arabia
Serbia
Singapore
Slovenia
South Africa
South Korea
Spain
Sri Lanka
Suriname
Sweden
Syria
Thailand
Tonga
Trinidad and Tobago
Tunisia
Turkey
Ukraine
United Arab Emirates
United Kingdom
United States
Uruguay
Vanuatu
Venezuela
Vietnam