World Hydrography Day
World Hydrography Day is held on June 21. This event in the third decade of the month June is annual. 
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The International Hydrographic Bureau was established in 1921 for the purpose of providing a mechanism for consultation between governments on such matters as technical standards, safe navigation and the protection of the marine environment. In 1970 the name was changed to the International Hydrographic Organization (IHO). The IHO is actively engaged in developing standards and interoperability, particularly in relation to the challenges brought about by digital technologies. In 2005 the IHO adopted the concept of a World Hydrography Day, which was "welcomed" by the United Nations General Assembly in Resolution A/RES/60/30 Oceans and the law of the sea. The date chosen for World Hydrography Day is the anniversary of the founding of the International Hydrographic Organization.
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