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NWS-Voluntary Observing Ships (VOS)
browse graphic The VOS Program obtains weather observations from vessels and ships traveling all over the world in the normal course of their business. The program relies on volunteer observers and operates at no monetary cost to the vessel. As an international program under World Meteorological Organization (WMO) auspices, the VOS Program lists 49 countries as participants. The U.S. program is the largest in the world, with approximately 900 vessels actively participating each quarter.