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Chart 1 is a publication containing all the information needed to interpret nautical charts published by the Canadian Hydrographic Service. Member nations of the IHO (International Hydrographic Organization) produce Chart 1 using a common format. That common format consists of Sections identified by letters and symbols, abbreviations, or terms identified by a reference number. All Chart 1s organize these Sections and symbols, abbreviations, or terms in the exact same order.

Traditionally Chart 1 has been produced as a booklet. This latest version of Chart 1 is also being posted to the CHS Web Site in pdf and in html format as well as being distributed as a Compact Disk for those who have CD readers on their computers. Both the CD and the booklet versions are available through Chart Dealers of the Canadian Hydrographic Service.