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In page Argentine Naval Hydrographic Service:

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The main mission of the SHN is to provide safe navigation on national waters. The service do so with the creation and maintenance of nautical charts, coastal marker buoys, and lighthouses. In concordance to the International Maritime Organization regulations, the SHN is also the global coordinator for the NAVAREA VI zone, which covers the South West Atlantic Ocean region[1] being responsible for emitting alerts to ships at sea and coordinating search and rescue operations.