The IHO S-57 Standard is the standard for digital hydrographic data exchange, which is used for the exchange of digital hydrographic data between national hydrographic offices and for its distribution to manufacturers, mariners and other data users. S-57 is the Standard used by official Electronic Navigational Chart (ENC) products. The S-57 Standard was defined as a civilian standard for creating electronic charts for commercial navigational purposes. IHO website - click here.
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