Definition
S-57 is the IHO transfer standard, in long-standing edition 3.1, that defines the object catalogue, attributes and encoding rules for ENC data. Base cells carry the .000 file extension and sequential updates follow as .001, .002 and so on. Its rigid structure is the reason ENC data from any hydrographic office in the world can be loaded into any type-approved ECDIS without translation by the user.
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