The IHO Secretariat communicates important information to Member States (MS) via Circular Letter (CL).  Some CLs invite Member States to provide feedback to the Secretariat (e.g. approval of new editions of IHO Standards).  In cases where MSs are invited to provide feedback via online form, the link to the form will be included in the CL. Further information is provided in CL 20/2019).

All previous years CLs are available from the IHO searchable Document Archive.

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Spanish Circular Letters are available HERE